I do my drawings in marker. I usually use Promarker or Copic to color the drawings, but for contour lines and black backgrounds I use a fine marker pen with a 0.4 or 0.5 mm tip. It takes some time to fill the background of an entire sheet with such a thin pen. But in this way I get exactly the accuracy and blackness that I want. Filling an entire piece of paper with tiny little lines is almost like meditation for me. If you want to see my original paintings, you can click here. If you want to see all my paintings and drawings, you can find them collected here under original art.