Looks like shit
Hmmm.. sadly Demi is right. Since it involves work i.e. livelihood I'll try and help you out.
1) His head is facing straight on, while his body is to a side. The fact of the matter is does he even need a body?
2) Eyes are a bit too big, if anything you should exaggerate the brain and make that cartoonish ie bulging out his skull.
3) If you decide not to have a body tilt his head to create interest.
4) Lines underneath the eyes need to be more subtle
5) Font\s (this in itself is a mistake himu) are hideous. Get rid of the speech bubble and make it a heading.
Is it a poster, a graphic etc?