Enhancing Hair Using A 2D Graphics Program

Here is my original picture:



I wanted to give myself longer hair (plus I just wanted to pactice on being able to create realistic-looking hair. I did some work on the original render above and this is what I came out with (so far):



I'm using the Gimp program (which is a free 2D graphics editing program) to enhance the hair on the 3d model. It still doesn't look quite right yet.