If you'd like to see some sketches I do randomly (far more frequently posted than fully finished pieces), check out my Twitter or Instagram! I do some ink designs and doodles just for fun and a good portion of them are made into actual tattoo designs for peeps. At least that's what they say but I have only seen ONE become an actual tattoo on someone lol
here's some examples below of the sketches I do on there so you know and I don't accidentally waste your time.
I ALWAYS sketch with pen unless stated otherwise. I don't sketch with pencil before hand unless I'm going for something extremely specific or I'm doing a commission.