Upload one photograph of the animal and it is painted — court portrait, naval officer, modern gallery oil, single line. The markings are the likeness, so they are kept.
One animal, facing the camera, in decent light. A clear head and shoulders beats a full body — the face is what a client checks first.
Optional, and it is set in real type over the finished painting rather than painted by the model — models misspell lettering often enough that it is not worth a generation. Change it as often as you like without generating again.