What are the walls in the other spaces opening onto this one Since this is a 4 season room IMO it needs to flow with the rest of the house.

The paint in that adjoining room is repose grey. It leads off of the dinning room.

Since you haven't been there for a year, you don't know how the sun plays with this room. Wait and see what the seasons bring. Then you'll have a better idea of what you can do here. If it gets lots of light most of the time, you can do a darker color.