DeVito looks good to me, maybe a hint of purple here and there would go down well? Nothing major, more a suggestion of purple done in a similar way to how you added the black on the dreads for the shade? I'm no pro but i think that could really help create a bit more depth and variation without being overwhelming.
Also I was wondering if you mind if i message you with a few questions about the airbrush? (Dont wanna clog up the wip thread) Nothing technical but from what you have mentioned in posts it sounds like we have similar spaces to paint in and i have avoided getting an airbrush before out of fears of the lack of decent ventilation and so on, So it would be great to get some input on your experiences.