There is really no single source I could refer you to regarding decorating these room accents, but quite often Traditional Home Magazine will feature homes with dormers, particularly in their spring editions. While that doesn’t help you now, let’s talk about some basic things. Since you have dormers and traditional windows in the same room, you are right in saying the treatment needs to match.

Black, white and red are a classic color combination. Very nice in certain instances but possibly not practical in a huge room. I’ve never seen it done well, even with a 4th color such as sky blue added. Please consider tweaking this scheme and also consider picking the paint chips out in person at the home in question. The lighting will be different and the room size, everything.