Thanks very much for all your ideas. I'm liking this size and colour saturation much better (it's not quite as pink as it looks here, there seems to be some reflection from the bright pink jumper I'm wearing!).
That tree definitely has to go so a bit of editing work to be done on Picmonkey to remove it.
I'm not 100% sure if I'll use this paper on all the walls or just the back one with a co-ordinating neutral paper, or perhaps paint, on the others. I'm leaning towards a neutral paper on the others right now but I need to think about it for a bit, perhaps while I'm working on the pink, with flowers, tutu dress that my 3 year old granddaughter's dolly REALLY REALLY needs right away apparently :)