1) Pick a color that goes nicely with the pet's dominant color. In this case, eggplant purple :)
2) Looking at the Photograph, map out the pet's features.
3) Paint mid-tone first
4) Continue painting, add other colors, details and...
5) Voila! Painting's finished, sign the back.
6) Take amazing photographs of it. Preferably with an elephant with a boombox, who could ask for more?