Looks alright so far, I must say the shading is a little too heavy on the top curved lines and the bottom thing, as BenDover said, you should make the curved lines with pentool and make them nice and smooth.
That blurry line thing around the blue doesn't really work too much.
You should just focus on trying to make it look sharp and smooth, I must admit it looks quite original. (well, it does right now) You were talking to me about AlphasoniK's head, try to get a similar style of shading used on this head as he uses. Just try to get inspired and don't make it so blurry and heavy.