Hi! It's Ryan from I Am Photograph. As a fashion photographer it can be difficult shooting on location when you are shooting for the 'next season'. This past spring I shot on location for a fashion magazine that was to showcase clothes for the autumn/winter outerwear trend. Being that it was spring the woods were bright green with new leaves and didn't really communicate autumn. This is where retouching in Photoshop comes in handy!
That's it! Learning to use masks and the hue/saturation can be very useful. You can apply this effect on a lot of things... maybe like changing hair color or changing the color of the shoes of the subject or eyes - it's endless!
Did you find this trick useful for a photo of yours? Post a link in the comments and showcase your work! Ryan