It does look really good. The main thing I would encourage is to not outline the face and let your shading and shadows do the work for you. The same with the lips - Unless a person has tattooed lip liner on, there are no outlines anywhere on a person's face. It's hard to tell from the photograph (sometimes camera's wash pictures out - I sadly know that all too well) but it looks like the drawing wouldn't hurt to have a few darker darks (more value shifts) to add depth.
Aside from that - love how you did the hair and the proportions are very nice and the expression on that face is great. I think for a casual drawer who does this for fun you should keep at it because you really have something. I would love to see more work of yours!