I'll take a look, but if you know anyone who does the same with watercolors, that'd be more helpful. One of the biggest challenges with markers is you have to work from light to dark-- you can't start dark and make things lighter, which you can do with oils.
Watercolors work similarly, however, because like markers, they're also transparent. So basically I have to think about 12 steps ahead and figure out what my light is doing before I do anything else. Light, uh... is challenging. But seeing how people handle the effects in real media will still be helpful, because sometimes you learn new tricks even if you can't use everything they're doing.