A decorative mirror would bring a bit more light in.

I second the idea of putting a large decorative mirror. Everything is dark currently, a mirror would definitely lighten up this space.

Also love pracheeti's mirror idea

A Whimsical Guest Bedroom Makeover · More Info

Here are some more mirror options. Another idea is a textured wall hanging

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One last idea is a fun gallery wall

Gallery wall hallway · More Info

Our design team can make additional suggestions. Ask a free question here. PS. Cute kids!!!

Decide if you want to take advantage of the slanted feature or not first. It could be an interesting design to mirror the peaked angles.

Whatever you hang, consider adding an art light above to add a bit of extra soft light.

If I may also suggest that you put in new bedside lights. Something more substantial and matching.

I love the height of your ceilings! But they do give a lot of wall space, so you have a lot of space to work with. A nice piece of large art would look great over your bed, or a mirror like others have suggested. If you are able to stretch the budget a bit then you could have the wall behind your bed be a textured wallpapered wall. The wallpaper will act as the art and that way if you add anything to the wall it doesn't have to be a large piece that takes up the wall. You could then move your lighting fixture closer to the peak. That way you could have a nice chandelier or pendant that acts as an art piece as well.