A few crits for you - I've attached an image with some things to maybe work on - in no particular order.Hope the image shows up ok.
1.Check out the clumping and how the hair is slightly wavy around the head.Be careful not to make it look like he's just come out of the hair salon though.
2.Your "brows/furrows" are a little too wide and blobby they need to be tightened up slightly.
3.Same with the nose except this time the nose needs to be loosened or spread out more.
4.Slightly bigger gap between the incisor and canines.
5.thin or adjust the tongue - yours is looking a little flat and wide.
6.Define the inner teeth more.
7.Check on how the lower hairs flows outwards and down around the base of the head.
8.An impotant one - compare how the flow of the skin and muscle to hair is related.This will define the structure and shapes of the head more.
9.Compare how the flow of the fine hair and clumpy hair relate to each other .
Hope some of this helps.
keep up the good work remy. =)