What don't you like about it? I think it's absolutely lovely!
I think what I'd be careful about is the characters blending in with the background. For instance, the top right of the fox's dress is a very similar yellow to the yellow in the background. The same with the bunny's bag and dress being similar to the mushroom behind it. If you shifted the values or colours a little bit. I think the characters would pop off the background a lot more!
That being said, these are still wonderful! I'm only being picky because you said you weren't totally happy with it. If I was reading a book with this as an illustration, my mind wouldn't have gone straight to 'What would I improve about this?'