Simple modified Gpen with color jitter and slight barely noticeable hue change every stroke.
Honestly just a very simple barely modified Gpen, has nice hue variations that can add interest to the areas where you’d like to have it, simulates detail.

I use it for rendering on top of the image at the very last step of the art, or adding small details. It’s also fun for doodling and quickly laying down base colors.
