During character customization I ran across 2 issues with hair meshes in game. On the first one (long ponytail with side bang) there is a very noticeable green and purple looking overlay when the hair is darker. The only way around this is to make the hair color lighter or a brighter color, but as shown with the pink hair screenshots, as soon as you make it a darker color the green shows up again.
On the second hairstyle (a short bob) there is a noticeable bald spot on the back of the head. I tested out these two hairstyles with gunner (f) and the same problems were present.