Insert on a new layer the texture of an old wall:



Select the Clone Stamp Tool to hide all those exfoliated zones on the wall, just not to make dirty our picture.



Change the Blending Mode on Multiply and make the corrections on the brightness firstly (ctrl+m).



Then make the corrections on the color (ctrl+u).



We have to merge down all the layers (shift+ctrl+e) and make the picture a little brighter than it is now (ctrl+m).