Ok, Photoshop for the colour. Another thing that I couldn't find out yet is how to make the reflection in the wooden floor smoother. Is there any setting in the reflection layer (or any other) I can change to make that happen?

I have this reference immage from the mexican architect Luis Barragan and wanted to remake the room in SketchUp. At the moment I have some problems with the yellowish atmosphere of the picture. As it seems that the environment colour doesn't have any effect i created a rectangular light with yellow colour, but the result was not very satisfying.
Do you have any tips how i could get this kind of interior lightning?