i don't think you need the dialog balloon, the posture and the expression of the bunny just perfectly conveys everything! Talk baloon makes it too obvious.
I like it. I don't mind the text, but it comes across like engrish (so decide if that's what you're after).
I would suggest removing the white from the shadow, and just punching out those shapes so that there is a good order of communication. You need to see the cute first and the surprise later. With white in the shadow, it either communicates at the same time as the bunnies or even before (by virtue of its relative scale).
About my design
hehe.....