There are areas in these that look good, but it seems like you almost lose interest after your done doing a wicked looking face. So that's what I mean, everything should be at the same level, and everything should have volume, or not have volume... otherwise it ends up looking a little jumbled.
Everyone is guilty of this to some extent. a drawing that is consistent is more impressive than one that has two or three well drawn parts, but overall is inconsistent. The well done parts make the less thought out areas look out of place.