I like what you have done, especially the piping on the headboard. Agrees, a different environmental background would add a different flavor to your scene but, what you have currently seems to work well.
You might want to consider pillows or a bolster for the bed and maybe a couple of pillows on the floor? Something it a complimentary color to the nice painting/art work you have on the wall.
This is a matter of personal taste. For my tastes, I would of chosen a much lighter color perhaps a medium beige or tan for the walls something to offset the darkness of the floor. Something between the white of the furniture/ceiling/other window (? on right wall) and the dark brown of the wooden floor. It would be what I would look for and it probably would be something I would have to tweak to get it to look just right.
A quick search on the Internet (see link below) perhaps the H or I swatch on the left might be good colors I would play around with. It looks like it lists CYMK code on the left, with RGB, & Hex settings on the right. It looks like this is a site to sell you a book but are many other color palette resources out there. Again, it is a matter of personal tastes.
Creative Color Schemes
Great job! It is a really nice scene and look forward to see more of your work. Thanks for sharing it!