I tried out a Tombow brush pen this week and it’s pretty great, nice line variation from thick to thin but just a little too chunky for the small stuff. I added some details and hatching with a carbon pen and some uni-pin fine-liners. After scanning and removing the blue line, the carbon pen lines are much clearer than the uni-pins. It’s also much easier to ink with the carbon pen, something akin to a dip pen without all the dipping.