Those scales look normal to me. Larger, older birds (and roosters) often seem to have rougher scales. Your birds scales do not look like those affected by scaly leg mites. Some of my birds have scales even a little more raised then those, and they have no mites (they've always been like that). To be safe, you could dip his legs in oil or slather petroleum jelly on, but I really think that his legs are fine.