I find colors somewhat unpleasant.

 Quite good for a rushed one ! =)

 Sorta reminds me of a piranha Plant. Good job! ;D

Funny (= the monster left serious))) 

Ahh, I see what you're saying. Perspective has always been an issue with me. Will definitely fix it later.

Simple and effective. Although... It's kind of hard to tell which way the monster is facing. From the spikes on top of the head, one might think he's looking to the right. But from the mouth, and the fact that the teeth on either side are pointing to different directions, he seems to be looking almost towards the viewer.

I'm using the term 'look' rather loosely, of course, as he has no eyes :)