If he wants to go pro there is a contest in this months Wizard TGTC where you can color a sample page from a top cow comic and possibly get a job with Top Cow/Image comics. Other tha that all I can advise is studying classical methods(i.e. watercolors, oils, crayons, pastels, etc.) and color theory. And I don't recomend it but my friend swears herbage helps...
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