Rabbit - Sketch

The colors are calming. I like the contrast between the pink and yellow—the muted palette makes it not too sharp. However, looking at the rabbit I feel like the shading doesn't work.
I understand you were trying to use a more limited palette, but using the same yellow color from your light halo on the flowers kind of defeats that effect.
The lighting is confusing. The halo indicates that there is light coming from behind the rabbit, but I can't really identify a light source based on the other highlights. Where there heavy shadow on the rabbit, the flowers are their lightest, so it is inconsistent. Compared to the amount of detail in the head, the body is kind of blobish, maybe because you didn't use as much deep brown there.

Despite these things the picture has good sense of form and keeps nice aesthetic. As I said, the colors you chose really work well. Good job.