I Might XD.....but, I wanna be careful not to get too involved with this picture any further. Well, not untill I'm about 100% certian of the direction i'm going with it becuase. of my current space limitations. I think I have enough to revise. but, you know. (I'll do something eventually.)

This looks good JK!. I think the best portion of this is the upper lip that touches the left edge of the image. It looks slighty cyclindrical, protruding out as lips usually do.
If you were to do something more to this, may I suggest some things?
For the teeth, give the line subtle qualities (taking away or adding to the line) to make it appear more as teeth and that you didn't just take the line tool and throw on some lines.
A more defined eye would look good. Maybe give it some color in the retna area, show that it's alive.
Well done on the highlights and great overall start.

You know...you do the neatest looking line art and coloring. You do.