Portrait of a girl

I tried to draw in semi realism style a long time ago, but this is the first drawing in the style, what I finished. I really loved to do the colouring.
I didn't used references for the whole face, but I searched for parts of the face on Google to understand the lights better (for example on nose, mouth or around the eyes).

The drawing took me about 5-6 hours. I used Paint Tool Sai and my pentablet.