All my pet portraits are drawn or painted using clients' photos as reference. The photos are key to a good pet portrait and I would want to work from the very best ones available to you. It's extremely difficult to produce a high quality portrait without at least one good photo and preferably more.
For the portrait pose, I need one photo clearly showing the head and shoulders, with facial features such as eyes, ears, mouth and nose in focus and with minimal glare or reflections. Other photos will be used for colour matching and for any details that may not be 100% clear in the pose shot. For this reason, I always ask clients to send as many photos as possible. As a general rule, photos taken with a mobile phone are not as good as those taken with a digital SLR camera, but they are more common these days and I can usually work with them. Just try to ensure they are taken at the pet's eye level and not looking down at the pet, as this can distort the perspective (e.g. out of proportion nose). Remember, you are paying for a portrait, not a copy of a distorted image.
Below are some examples of reference photos that have been supplied, good and not so good.