I sometimes use a normal brush and india ink sometimes I use a brush pen, it really depends on my mood. For this drawing, I'm using a brush pen made by pentel
www.dickblick.com/products/pen…They have cartridges and are my favorite brush pen out of everything I have tried so far. IMO of course. I've been using ink about 3 years now on a consistent basis and so I've had lots of practice. e___e It helps when your teachers are comic artists and cartoonists. XD