I love this picture! I think the main reason it's so good is because of how much emotion you put in this guy. The mish-mash of colors is freaking awesome. I even love how there appears to be a fairy or something on his head. I'd love for you to make a flash cartoon featuring these designs. Well, maybe you already have.
It kind of reminds me of Christmas, with the red and green colors. In fact, even his cane looks like a candy one! Anyway, the amount of detail is fantastic in this. He really does seem to be looking at the viewer in this. That may not have been the intention.