Now, this isn't on you, but all the 3D hair I've come across in my time. I feel it is too...um. Well, they understand that hair grows in "clumps" that form "layers" and "sheets," but I find that it always looks rather fake. It's too regularly spaced and the "clumps" too similar in size, texture, and shape.
Oh! That's what it is on your character--the hair that is visible is too similar and even. Even on people with symmetrical hair cuts both sides are not the same. Try making the shapes and sizes of the clumps/strands more irregular and random.
Hope that helps.
-Chaos