I had to learn a bit of photography in order to take product shots of my clay models. But the art-selling site I was trying to apply to turned out not to sell 3D art, only 2D things like paintings.
Here are some of them:

^ Ultima [reproduction, Final Fantasy XI]

^ Decarabia

^ Demon [reproduction, Final Fantasy VI]

^Archwight "Water"

^Snake in Mopani