Hey hey,
Another bunch of hopefully useful advices. I will probably collect it all, make some nice pics and share it as a tut, but don't have a clue when. Probably on my vacation in August.
Wait, I was supposed to get some rest then :-) Oh, well.
Ok, so:
Don't be afraid of experimenting! Use overlay and multiply layers over the one you're working on, with different colors to see how it affects the look of your coloring. Use even dodge and burn sometimes, with different ranges (Highlights, Midtones, Shadows etc), but don't overuse it and don't use it as a main tool of your shading. Rather to highlight some element (works well with metal p