hey, just a not on the hair, i feel some times it looks more natural for the lines that make up the hair to be curved,
your current hair looks a bit like the top example, very pointy and straight. this is fine on some heads but i think that the bottom example looks better, it still has those points that you put in but it looks more natural, in Photoshop im sure there is a tool for creating curved lines like this. personally i use sai but Photoshop is more advanced and will have the equivalent to our line work tool