It'd be so cool if after he said "damn" all his organs were to fall out in a heap :D
Needs organs... rip anyone open and you'll rarely, if ever, find a nice, clean, empty ribcage. Also, maybe a little more expression change on the face, he did just burst open after all.
I really like the job on the grass though... more of the same attention on the cloud maybe?
you also need to work on making smooth curves/circles, cause your speech balloon could be a little rounder.
WTF! what's up with that guy?
anyway, apart from the animation, I think you need to work more on proportion and human anatomy.
Thanks alot for the comments. I'll definatly try to improve it somehow.