I came across this on the 'net, a convention sketch I drew for somebody somewhere. These things are hit or miss, though naturally I try to have a basically acceptable image I can do in my sleep and that won't embarrass me if I chance upon it later. Every now and then my unconscious butts in and I accidentally do something that surprises me, like this one. I always use a ball point, on the principal that the ink comes out of it no slower or faster than the rate as my artistic brain works. Also, I have acquired a facility with it so that you can see some variety and spontaneity in the line.
(click to enlarge)