The price that the vendor's charge is dependent upon the number of portraits that need to be created. Some portrait artists work on commission, meaning that they do not charge any fees for their services. These artists include Mary Wells, Karen Sandberg and Annie's Pets. Some artists charge a flat rate fee, which means that the price will not change unless the number of portraits increases. Some artists work with several different clients, so it is helpful if you know what artists are available to create your custom pet portraits.