i think you should work on your line quality in real life.
it looks super awesome in illustrator i think you should mimic it.
it starts off thin then thick then back to thin, do that.
and i dunno if its the marker bleeding but try to steady your hand.
get microns, if you dont already, the nibs vary in size but they have microscopic ones for detail and they dont bleed!
shits pretty cool though,
i think you should make paintings and do that splatter shit you do in illustrator with water color, on water color paper.
actually thats a request. DO IT......WITH MICRONS!
PS if you dont know how to go about doing this the way i want it, ill be happy to explain.