Shadow line pen?

[Czar]

What can I use for nice looking shadow lines around doors, hoods, etc.? I have been using a Sharpie Ultra-fine, but it isn't really fine enough. I would like to find something that i can get in a dark gray. But, black is fine too. Thanks for your help.

[Dangermouse]

I use
Copic Multiliner Colour Finaliser Pen
0.05mm
If you get a grey or olive then you get a little more subtle shadow line than with black

cheers
David

[Ky.Slot Racer]

use black or charcoal acrylic paint, brush in the lines, let dry, then use a wet q-tip or rag to buff off the excess.