My my, free advertisement
cool finally I see my tutorials getting spread around after a year
Its an okay scene, but my advice is to study a good head tutorial or some detailed tutorial, take it all of the way, see what you get, then, do it again, it should look better, post it, accept all of the criticisms you get, try to improve on that model with those crits in mind, now try the next step in that tutorial and basically follow the same momentum.
So for heads:
A simplistic head model tutorial
A game head tutorial
Joan of Arc Tutorial
Tutorials on Facial topology, get the loops and everything right -My stage if you will-
Further advice and tutorials on head modelling
So a simplistic head would be a low polygon head with some definition for eyes and nose, where a texture will make it look good, similarly for a game head, the Joan of Arc tutorial I did many times and practised many times, it helps, a lot. Also try to get the most crit as possible, I used to post here, C4D Cafe, Cgtalk and 3D world, I got a good range of crit, also enter contests (as I see you have) it gets the old competitive gene into action, where you try your hardest, it sometimes can bring you to that next step, by entering 3D world's creative challenge, I turn my crappy sephiroth into a kickass sephiroth.