I'll give this a shot. digital art can be done but for the moment I'll have to give you some traditional examples (I'll try to find some recent digital art that doesn't suck)
the images are too big to post as html so I'll just link em instead
http://mephilesthedark-44.deviantart.com/#/d33gsae
http://mephilesthedark-44.deviantart.com/art/Stay-Gold-182770315?q=&qo=
(this one is a work in progress) http://mephilesthedark-44.deviantart.com/gallery/#/d334xfr
those are only a few, if you choose me as an artist the actual pets/adoptables will be alot smaller an cuter, and probably a LITTLE less realistic as some people find that kinda ruins the fun a little.
In case the images don't work, heres a link to my deviantART profile http://mephilesthedark-44.deviantart.com/