Unfortunately anime (the commonly used term now for Japanese animation) is not taught widely in the US so your best means of learning is to study it and learn by example (and again all the while looking at other form of visual expression). One thing that the Japanese productions seem to generate a great deal of is quality art books after the fact. These books can be an invaluable source of knowledge into how the pros do it and they're power to teach the student with the right perspective and approach, should never be underestimated. Outside of anime is of course the art world in general and volumes of material is at your disposal if you know where to look. This page is our little section of books we certainly recommend you seek out if you're interested in this kind of work. Or you can simply wish to expand your horizons.

-aneamo

Or, if you're a fan like myself you might buy said books for the great pics! Either way, you're getting something good, that's for sure.

-goshou

Some great places to start shopping for anime art books