Caricaturama-Sting

I couldn't just draw Sting for this week's Caricaturama, I had to do all the members of Police, since they were a major part of the soundtrack to my late teens and early twenties...

This started out as a marker sketch that I photographed with my Police pin (that was worn on my collar in high school, on days when it wasn't a Beatles pin :)

Can you tell what small changes I made in coloring it?