I have not said much about your design techniques Dave, So I give it a shot.
"They're unique, different, and spectacular."
There I said it. And I personally like your cartoon-like designs. They're fun to look at and express much creativity.
Now for some advice from a friend that will definitely improve all your future design endeavors...
Jack Gephart is one, if not "the" best life-like hapter skin designer here at Zabaware. Whatever he says, it pays to listen. No joke, this guy can make an awesome portrait!