Nice, really nice :).
I like the nose, it's well done and not in a wrong size. Because the noses I draw always get something wrong.
However, the shadows. They didn't work out really really well, maybe you could have faded it a little bit.
But they are at the positions where they belong, and that's a good point too :D.
Due to the lack of colors (which isn't a minus) I'm more looking at the shadows. Because they give some color to the drawing, if you know what I mean.
And when they are not very perfect, I am inclined to dislike it. Which isn't exactly true with this one, but it's a minus of one star :).
I recommended you for the portal, because I know you can draw fuckin' well :D. Godd luck with other drawings!