It’s a little early to get too crit heavy to be honest, but it looks like an ok start.
Have you considered Strip Modeling? With this technique, you extrude an edge down the profile (one for front, back, left and right side of each appendage). Once your silhouette is correct, you bridge all the faces together to form solid shapes. This guy is an example, look at the first image of how the neck, jaw line, side profile, etc are a single strip, then he fills them out later. This way, your character gets a solid shape before you do a whole lot of work.
http://forums.cgsociety.org/showthread.php?t=395821
A lot of people love this method, but whatever technique works for you.