How to Choose a Reference Photo for a Pet Portrait

Choosing a photograph to send to an artist is a different job from choosing one to share. A portrait is built from what a file shows: the shape of an eye, the fall of an ear, the way the mouth closes. Some pictures in a camera roll carry that information and some do not, and the ones that do are not always the ones you like best. Start by selecting a main photograph, gathering any useful supporting views and writing a short note.
Start with the expression you recognise
Open the album and mark the pictures that catch you before judging anything technical. Those choices carry information about character, and they are worth keeping even if they turn out to be weak as references. Then separate two questions that tend to arrive together: which photograph reminds you of this animal, and which one shows enough to draw from. The answer is often two different files.
Say a dog has a particular way of holding its head when it wants something, and the only picture of that expression was taken at dusk in a dim kitchen. Keep it as a note about temperament, and look for the same tilt in a sharper frame taken in daylight, even if the moment is less striking.
A breed photograph shows a type rather than this animal. Your own clear pictures carry the individual features an artist needs: the width of the muzzle, the set of the ears, a coat a shade warmer than the breed standard.
Look at the face before the whole photograph
Zoom into the head before judging the rest of the frame. Check the eyes for a clear catch of light, the nose and mouth for a defined edge, the ears for whether the parts needed for your chosen pose are in shot, and the markings that make this animal recognisable from across a room. If an eye disappears into shadow at full size on a phone, say so when you send the file. The artist can ask for another photograph or discuss a different treatment. Naming the gap gives you a clear question to resolve together.
A copy is not always the original. Screenshots, forwarded images and pictures saved from a message may carry less detail than the file they came from, though some ways of saving keep everything. Send the original where you can, and ask whether the version you have is enough rather than assuming either way.
Clear facial details

Soft facial details

Check what light and angle are hiding
Backlight can put the face in shadow. Overhead light in a kitchen may drop a shadow across the eyes. A warm filter can change the apparent coat colour and make the original shade harder to judge. Look at what the light has done to the parts you care about before you decide.
Angle is worth comparing in the same way. A photograph taken from above changes the proportions of the head compared with one taken at eye level, and either can be the right reference depending on the pose you want. Put two angles side by side and see which one shows the features you are asking for. Starting near eye level is a practical option for a head-and-shoulders portrait; it is not a rule for every picture.
Look at what sits in front of the animal as well: a paw behind a cushion, an ear cropped by the frame edge, a harness strap across the chest. Ask whether a partly hidden feature matters for the pose you want.
Choose one main image, then add only what helps
Choose a main photograph for the pose and expression, then ask the artist which other views would help. How many others, and which views, is a question for the artist. Some work from a single photograph; others want a profile or a full-body shot as well, and the answer changes with the pose and the size of the painting.
Combining separate photographs into one portrait varies by service too. Some artists will take a head from one picture and a body from another; others work from a single image only. The same goes for two animals in one painting. Ask before you build a folder around the idea.

Write a brief the artist can act on
A short opening note can name the main reference, the feature that matters most and anything you are unsure about.
For example: "The main reference is IMG_4821.jpg, the one where she is sitting on the kitchen floor looking up. I would like to keep that expression, with the ears half back and the mouth slightly open. Her left front paw is behind the chair in every picture I have, so can you tell me whether that matters for a sitting portrait?"
Adjust the wording to the animal and the portrait you want. Keep the file names exact, attach originals, and check permission before sending a photograph somebody else took, since a commissioned painting is a new use of that image.
If the photographs are old or limited
If old prints, scans or small phone pictures are all you have, describe the available material and ask what is possible in the style you are considering. Grace Murray Rowley's reference guide invites people with only a few memorial photographs to send what exists from across the years and talk through what might be possible, which is one artist's approach rather than a rule. Ask the artist you are considering what they can work from before you rule anything out.
If the portrait is a memorial gift, ask the recipient whether they want one before you commission it. Let them decide whether they want a portrait and how they would like to remember the animal. There is more on that in why handmade gifts feel more personal.
A final check before sending
Four things are worth confirming before the folder leaves your outbox. The main image is the best available version, with the original included where you have it. The other images show what the main one hides. Your note names the feature you care about and the gap you want answered. And you have asked about anything you are relying on: how many photographs the artist works from, whether there is a stage where you see the likeness before it is finished, and what happens if the result is not right.
Penny Louise's reference guidelines ask for a clear original photograph and natural light, and suggest getting in touch before combining separate pictures. Her requirements are hers, and another artist may ask for something different. If the portrait will hang in a house with animals in it, a pet-friendly home covers the practical side of where things go.