Exposure and clone stamp tool

Select the magic wand tool/Click+shift (to select the desired area)/Image/Adjustments/Exspourse/ Change exposure levels.

I changed the sleves and the collar on my model's jumper so that it would match the colour scheme more .

Select the clone stamp tool/alt+click/release
I used the clone stamp tool to clean up the areas around my model's jeans so the colour of the jumper wouldn't appear photoshoped.