Joop,
Looks good!
Let's make the big guy's outline be one color, the color of his back should be his outline color, not mixed.
Also, the big guy's shoulder is bigger than his bicep. Let's make the should line half the length, and add a big bicep. The picture at this link is a great reference point:
http://www.swilers.com/Portals/0/bicep.gifAlan of HeroStatus