Have you tried adjusting the colours in a photo in curves? I had taken a bland photo of a tree outside my window and I decided to see what I could do with it. I wanted to increase the contrast, change the colours, add brightness to bring out where the light was in the photo to differentiate between the tree leaves and the background.

Curves is like a graph, by changing the height and depth of the curves you can enhance brightness and colour by making the curve higher, or lower the curve and the image loses brightness and can lose contrast too….. The curved graph representing this was up and down then back up again. All I can say is have a go and see what happens. You don’t have to accept the result and you can go back to how it was originally.