For this digital illustration of a female centaur in a fantasy landscape I used my wife, who is a beautiful Sagittarius, which is basically a centaur; human from the hips up and horse from the hips down. So I took a snapshot of her at the beach and in Adobe Photoshop weaved it together with three other photos that shared compatible lighting: a white horse on a farm, a teletubbies-esque landscape, and a nebula via hubble. This composition required plenty of masking, adjustment layers, repair and clone tools, filters and so forth. The result is fantastically mythological and convincing. And really… my wife is lovely in any form, eh?