First, I have Photoshop in German, but I found a translation for it. So if I show pics,
it's in German, but it looks the same on PS anyway...
In this tut you'll learn, how to set some highlights onto your bases.
I've cutten out this part of the picture:
Next step is to set the colours =P
Image --> Adjustments --> Selective Color
You should've that window on your screen, now: