Bunny

Very nice, I really like how you did the ears and the softness while still making it look like fur.
I also really like how you did the eye, it looks really 3D. The blurring in the background is also really nice, it really gives it more depth.

It looks like you tried to put the bunny in perspective, and that half worked and half didn't.  Some of its body positions look a bit awkward, and I think he head is a bit too large compared to the rest of the body.
It would work in perspective, but only the head is in perspective and the rest of the body seems to be reasonably in proportion with each other.
The background itself also doesn't quite help with the placement of the bunny, the two clash a bit.

Also the grass is REALLY short, like extremely short. I have a rabbit myself (Used to have two, one passed away a long time ago sadly.) We always let him run around on our grass.
Therefore it might be a bit more clear for me that the grass isn't the right size and thickness compared to the bunny. I suggest maybe using a reference image for hits, it really helps believe me.

Overall I really like what you made and with a few tweaks here and there I think you could make a major improvement with relative ease.
It is clear that you haven't practised much with backgrounds yet, I definitely suggest practising simple backgrounds just on their own. That way you can improve much quicker with your backgrounds instead of only making them for bigger pieces.

I hope this was helpful, I Found your work through.