mahishasura - i first sketched it roughly on a paper. after that i took a complete white document in photoshop and pressed f twice.
after that i took another two papers and placed the rough sketch underneath and hatched the shadow and highlights on these placing them on my monitor. i dont have a light box. then scanned them and changed the blend mode of shadow linear burn and the highlight linear dodge. after that i took a gradient layer and placed it at the bottom most.