Hey Ben good to see you here...as Daz points out the edge flow isnt exactly the greatest...Near his chin area it seems, you can redirect some of the edges in that triangle-like quad to the next edge that flows down and makes a sudden 90 degree turn but its good to see you posting...keep posting updates..
Currently working on modeling a Bugatti-Veyron-Sang-Bleu. Wanted to try something that was different, unique, and organic/flowing so that I could really get a good understanding of edge flow.
I think it's a good start, id change the flow on the sides of the nose, make them flow into the eyesocket. Usually i prefer to run the nose edges all the way around the skull instead of ending them between the eyes. Also dont leave your edges flat on the nose, bring the outer ones down a bit.