Liara Tsoni drawing

It has been a long time since i posted something here on DA. I was to busy for doing finished drawings, and i dont like to post rough sketches.
But now, i got my vacations, and can draw a lot. And the first thing i want to practice are drawing convincing faces and reallistic portraits. At the beginning, It´s an easy thing when you know proportions and how to construct the head, the difficult part is to render the actuall face with lights, shadows, and lines.
Any ways, i think this is a good start, I like the result. Hope you like it too, and give me feedback if you can.

Liara T´soni is a Mass Effect character and is owned by Bioware.