I was looking more into your face. The coloring you did to the background (less important part of the picture) was really good! But made your face lose it's natural color and gave you more of a sickly look. Also, the lighting and working with the wall lost most of your shirt into the background (hard to avoid.. not your fault) , and your hair brightened up loosing detail. So yes, your wall is now a perfect replica of your real wall, but in the process you changed 'you'. I don't wanna hate on you, just friendly critisim. Try doing it again and get your skin colors right and burning down your hair a bit.

and instead of using color masks and things.. select the wall and just use hue/saturation, and bring the saturation down, so the colors fade them selves out to a black and white. Just somthing to try. Pure.