Three nice bunnies I've run across.Shaun Tan:
From Shaun's picture book, The Rabbits.This was the first image I saw Shaun's and I just fell in love with it. The book was shown to me many years ago by Jenna Felice, an editor at Tor who passed away tragically young. It was given to her, if memory serves, by writer Justine Larbalestier.
Cathie Bleck:
I believe this was a personal work in Cathie's wonderfully organic and sensuous book, Open Spaces. More on that here.
Bill Carman:
I first ran across his Bill's work on Concept Art.org. His site is full of great work. It would be tough to narrow down but I think the top hatted crows in the drawing section are my favorites.