personally, i just trace parts of my body over and over until it looks fluid. i usually have to do it A LOT more with my left hand because its retarded and doesnt like to cooperate. i kinda play around with things that i think look cool. if i find something i like, i keep practicing it until i can remember it and its looks good. but yeah. i just do random traces and try to link them together in some way that looks good.
and yeah. cant say i would trace with a knife. i might be kinda crazy, but ive cut myself enough times on accident anyway
