I use three depending on how im feeling! A generic rough blue sketch pencil I found forever ago for the pose/roughs, one i got from the csp store called 'snow whites pen' for clean sketches and if im feelin in the mood for a cleaner sketch look I use one I just called 'sketch/line' i have no clue where I got it from but I'll see if i can link the other ones in the twitter post for this! :D I def use a crap ton of brushes, im just a brush hoarder JHSFDFJHDS