From what I know, this looks about right..
I made it for a chat program I'm soon to be working on. It will have avatars and these are the beginnings of my models!
That's a good start. The shading of the facial structure is pretty good, though it could probably use a bit more definition and a bit less dithering. I don't like the grey outline on the eyes, but the shape isn't bad. I'd like to see the female head a bit narrower.