Welcome to ASN. =) This is leaps and bounds ahead of my first forays into digital art! You've definitely captured how she looks. I'd like to see your traditional art, since I assume you're more experienced with that.
Besides the obviously unfinished hair (although I think the eyebrows already look fine, depending on how much detail you're going for), be careful not to go overboard with the soft shading of the skin. Some crisp contrast, kind of like some of the detail on the nose, could go a long way towards making it feel more real. The lips fare better with the soft shading, but they could still use crisper lighting.
Thanks so much for the feedback and the warm welcome. I'll definitely touch up on the shading and stuff when I'm done with the hair. Thanks again! x