Totally adorable! I love the contrast between the cartoon bunnies and the realistic background. Black and white too is a great touch! Small crit (though I can't tell if you did it or not) rabbits don't have pawpads, only furred feet.
Are you planning to colour this any time in the future? I'd love to see it in colour!
I can't imagine how you dare to say it is an sketch!! I like a lot the scene.
However, the scene looks very realistic and the rabbits are cartoons (obviously). Maybe it will match better if the tree didn't have so many details (although it is my favourite part...), so that everything will have the same cartoon appearance.
I'm really curuious about which program have you use (photoshop or another?) and i wanted to ask you if you have ever uploaded a step by step work in progress video (or group of pics in a single photo) like other artist do. I really like your works and i would like to have something like that to learn of your experience.
Thanks for sharing your art, i really like every of it (even if i don't usually have time to comment )