I would paint the walls pink--go at least one shade lighter than what you like or else you might have pepto bismal walls.

Then you could do a blue ceiling with white "clouds" on it. If you cannot paint the ceiling, I would put wallpaper border half way up the wall, paint pink below it and blue with the clouds above the border. Plus the comforter looks like it has a lot of blue in it, so I would do something to minimize the blue, having it look like a sky with billowy clouds in it would help and look so cute.