I see your problem. When you make hair slick and thin, it becomes rough and confusing to draw on the edges. In my edit I gave it a few pixels more of volume on the sides on top and let the hair fall uneven and a bit messy. This guy looks like a kung fu master so we can't expect his kungfu hair to be symmetrically perfect o3o
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Lol at the kungfu thing. I personally dont like to draw hair, i prefer objects for heads... lol. But hair is annoying. Most advice I can give from someone who doesnt draw hair all the time is Draw the head shape and then the hair. Dont try hair last, i find it diffucult. I also like to mater glimmer light shading (random bright pixels matched by regualr color pixels that dont vary much). This will give it a
gel affect, as if sun is shining against gel. Also the "combed" affect as when you make slightly darker color then hair and stream in in a direction you would comb it. heres an example, not a very good head but it gives a good idea of what im talking about the hair and gel. The hair form itslef needs some work tho.
PS: This is the whole head template. If anyone happens to want it you may have it, please inform me you are using it although