I am really liking these, in particular the Red Mage strikes me as quite neat!

Unfortunately these all are pretty much well past my level of possible critique. The only possible thing I can see is that the white mage looks a bit too thin(not in one place but all around). But that is a form of stylization and thus isn't an actual issue. It is just something that stuck out to me when looked at side to side with the others you drew.