If you can't clean up the painted edge, you could always add a 1x3 piece of wood as molding. You can even carry it up to the ceiling to frame that wallpaper. I don't see that paint color in the wallpaper, or maybe it's a lighter version of the flower centers. Maybe stencil on a design using the darker color, or another color from the wallpaper to help tie it together. Then narrow floating shelves or vertical frames or something in the painted areas it you feel you need it. Maybe turn the bed around so the wallpaper is the headboard.

I think the kitchen you posted is really cheerful, young and full of energy. Nice retro feeling. It's interesting to compare it with the one below that I just found on Houzz -- which I must admit is closer to what I would choose if I were going green and yellow. But then I'm neither young nor full of energy. I love that there are so many different ways to do things. (I have to admit that in the one below I don't think the blue/turqoise accents work too well.)

It's difficult to get on the bed and off it, in a platform bed. Also if you wake up in the night without lights chances are you may hit the platform when getting off or on.

An uninspiring view of building next door was camaflouged with the help of lot of indoor plants -big and small in beautiful planters and other accessories. Stained glass birds sitting on a branch, colourfull bottles and metal butterflie fixed on glass panes made this sitout area very inviting.