It's a good start, but you can easily make it look more like a bunny by adding a few more details. Try to shade it more like something round. Your bunny is made out of lots of round shapes. Let it show. Also, the ear should cast a shadow on the body. I upped the contrast and changed its color to white. You can keep your gray if you want to, just try to add some more color to the palette to make it more interesting. Also, its head isn't shaped much like a bunny's. I changed the nose a bit, too.
Things I didn't change in the edit is the tail, which is much too big, and it should be less round. Like mentioned earlier, its paws doesn't have any claws. You don't need to draw the claws themselves, just make the paws a bit less round.
I hope that helps.