Another option for purchasing custom pet portraits is through an online retailer. There are several artists who create custom portraits through digital photography, and you can often select from a variety of images during checkout. Each artist usually offers a small description of their work, and several pictures might be offered as options as well. You can contact the artist directly to inquire about their prices and techniques. Some artists also allow you to send your own photographs and paint samples to have them modify the portrait for you. This option usually provides the most choices, since you can use as many images as you like and you'll receive a certificate indicating your work.