I like your illustration! The seeds blowing through the air is a great image, I like how the girl's hair shows the same motion. I also like the bunnies watching her. Your illustration shows depth by progressively lightening and softening the colors. I think that was done really well.
I agree with previous comments about the tree gap on the far right.
I also think that the leaves on the closest tree need to have some darker shades like the trunk and grass below it.
Lastly the first hill ends right at the fence post, and I think it should extend a little beyond the post. Only because it seems strange on inspection.