sometime you don't need formal training, but if you want to.......
check this place...
3dtotal creates a wide range of educational and inspirational resources for artists, including high-quality art books, a quarterly character design magazine, and anatomy reference figures.
3dtotal.com
also to expand on that
Concept Art World features concept artists, illustrators and designers.
conceptartworld.com
you can expand into graphic arts and design if you work on you portfolio they're can be a lot of doors opened for you....in many different arenas