Okay.
First of all, the trainer sprite. I tried to fix the right leg, bu then something came about the head and, well...Harry was 'eh' about the whole thing, so I ended up taking some time on it:
The chibi soldier is cute, nothing there to fix, really =]
Finally, the grenade. Pretty cool! the only thing I would say is that the smiley catcher makes it look off on the whole. If I were you I would either place it hanging in midair or completely remove it from the grenade.
Glad to see your thread Max, I hope you share your future art here, too =D
edit: FIEN THEN I HAD PERMISSION THROUGH MSN
And I didn't know about the grenade.