Over the years, I have painted a lot of miniatures in a red paint scheme for my armies. I have often been asked what colors I use and when I tell people they think:
A. Games Workshop is the only one that makes paints. or
B. They think its too many colors and too hard to do.
So the following is what I did today on a couple of Romans and couple of Normans in the next batch of minis that I am working on. For my initial stage I block in the reds with a large No. 4 round brush, using Vallejo Model Color - Hull Red. If you do not have that you can substitute Reaper Master Series Red Brick. If you have just GW colors, I can't help you.