The one major rule for painting 3mm is this: always paint in lighter shades than you think you will need. Particularly the base.
The base needs to reflect as much light up into the figures as possible. So with ancients I go for a bright medium green, heavily drybrushed with a yellow green and the lightly drybrushed with a pale yellow.
I flock in sparse clumps, using the brightest or palest green flocking I can find, and always let a lot of base color show through. Here are the Germans, all varnished up and ready to flock. The group on the right has already been flocked and is finished.
We get slapped around, but we have a good time!