Not quite a scowling zombie, but he doesn't look happy either

Yesterday I wasn't very pleased with the way my zombie face looked.  So after work I did a few alterations on the brow line, and the result looks much better.

I haven't actually changed the face very much.  All I've done is given it a slight frown, but it gives the face some expression which wasn't there before.

I've also started playing around with skin textures on the right side of the face.  Again, the changes are subtle, but you can see that the skin is becoming slightly wrinkled.  Ideally I want it sagging off the head a bit.