I have two main styles that I use: a very finely executed graphite style and a looser, more fluid style in watercolour and indian ink. Most of my work is the former but commerically, the later is more in in demand. However it’s harder to do because I have to let go a bit more. You have to trust the ink and the brush and accept that a splat or quite flurry with a brush could muck the whole thing up. Even though I have Photoshop (Gawd bless that software), you still end up holding your breath at certain points.