I took Phil's advice and looked at the 'How to Draw Cartoons PDF to learn how to build up the characters so that they have structure. Using the successes in the previous developments for the design of the head and general look. I felt the top left drawing was the one I would work off from and take further.
I used tracing paper so that I would have four identical structures and I subtley changed a few things in each design such as hair style, size of features and shape of shoes. I feel the top right and bottom left drawings are stronger because of the sharp spikey shape of the hair gives overall look a classical villian feel.