Some purists will say that it is cheating, but for the modestly talented painters this is a great tool: archival India Ink artist pens.
The pens have ink in them that covers very well on any painted model and it looks great. They come in all different tip sizes and are very useful for painting banners, scrolls, ornamentation and other intricate detail work. Eye liner, shading, the options are endless. I myself only use it when I feel my painting will not do the job.
John has been using these pens for a while now, I started using them on the Iron Snake Slaves
Using the white pen I drew the design and later touched it up with a bit of white. Same with the prayer scroll.
Try it out, it works really well!
You can find the White Pen Touch here
You can find the Faber-Castell Pens here