A wall full of abstract goodness. XD
Yellow is good but using just just this one color on the wall looks overkill. Maybe you can try adding a few more colors to make it little less bright. But I think you already know that. There's no harm in trying new stuff. :)
The scan itself could do a little more tweaking in terms of brightness/contrast.
Other than that, it's pretty well done. Keep up the good work.