A friend of mine paints miniatures for a living, and has started making tutorials for some of the minis he paints. If anyone is interested in painting Knight Models' Marvel Universe minis, he does fantastic tutorials for them in particular. He also does The Hobbit and Infinity. Please check out his site/blog, it's well worth a look for the gallery alone. The guy's ridiculously good.
https://opponent-theory.blogspot.co.uk/p/tutorials.html
Thanks!