I agree with everything said.
mateo_sancarlos: Yes I will work a bit more on the ears, I think giving it a bit more detail will go a long way.
memaci: You are right, he is a friendly demon. The kind that only makes you sin a bit.
Mark: Yes, that is the part that I most like about it. I think I will ad some lines in the back of the smilie and make it a bit more prominent.