Sorry, I wouldn’t put anything up there. Your headboard is high and that makes the art too high imo. The pictures in frames look granny-ish. (I’m a granny so I can say that.) maybe you could stencil something very light on the wallpaper you have. They have all kinds of transfers and decal like things as well. I think I’d try something like that.

Should I keep the curtains white?

I wouldn't put anything up there either. To me, your headboard stands alone.

Does everyone agree the bedding should go?

I agree on nothing on the wall above the bed. I also agree the bedding should go. I dont mind the white drapes, but, they either need to be replaced, or ironed or something. They are very wrinkled. Also, the first picture you posted, doesnt show the bluish color of your paint. In the second picture, it shows bluish on the one side, but, not on the side with your lamp on, so thinking maybe the very first thing to do is to change out your light bulbs, to much cooler bulbs (Daylight), so your colors actually show exactly what they really are. The bottom picture, shows the paint color better and I do like it. Cute dog. :-)