Don't be afraid of using a dark colour on the walls, as long as not every wall is dark (as suggested by Dytecture the room will not close in. Keep your bedding a light colour for contrast. The larger windows could be treated with curtains/sheers as this would make a great seating area for a wingback chair and small table for reading etc. The other windows could be covered with a vertical treatment to help lift up the ceiling. I might suggest interior faux wood white (or wood grain) shutters or similar curtains to the other windows but hemmed to fit the size of the window (no hanging to the floor on the smaller windows). The headboard of the bed on the lowest wall with a low headboard to fit under the window would work or if there is no doorway on the right wall (foot of the bed facing the short wall with the two windows) a larger headboard would work there. Update the light to a chandeliar or drum light fixture. Good luck.

Please Help. Windows need help

That is a good idea as the sun's reflection can cause a lot of stress on any plantings that might be along the wall. When we bought our home the block wall was white which was not good so we ended up having it painted a medium-ish beige and that color absorbs more of the heat. However over time the color has faded and is showing an almost pinkish hue. So it's now time to paint again and I am in the process of picking a color myself. It really is up to you as to what color you want. I would look on houzz photos and search exterior wall colors and see if anything pops up that you like. Also, just head to your local paint store and start looking a paint chips. You can purchase a few sample colors as well.

Would look awesome painted a dark gray with all railing in a darker char goal almost black to match the Windows, the other end would be bright white with dark railings