Salaams and thank you for your query.
I have put together a few pins relating to your query on the Ask Nanima Decor Drama forum board under "Cherrywood bedroom" here - http://www.pinterest.com/zakkiyak/as...r-drama-forum/
In terms of your walls, it sounds as though the pale blue works as it is in line with accent colours in your curtain. Unless a repaint is needed, I wouldn't change the wall colour, in which case, I would still suggest a pale aqua like blue with the wall behind your bed being a darker shade of blue. Have a look at this pin, the palette works well and it is timeless. http://www.pinterest.com/pin/224476362651437193/
For your built in cupboard, my fear of continuing with cherrywood is that it will darken the space. I would rather recommend going for a white finish with a wood grain formica or max on top. You could even choose a warmer white that is closer to cream to complement your cherrywood further, however a plain white will work alongside blue just as well.
To tie the look together, I'd suggest you introduce coral and navy in soft furnishings, like throws, mats and cushions - http://www.pinterest.com/pin/224476362651437227/
Hope I've helped and happy renovating!
Zakkiya