Copy your picture to a new layer and then with that layer active select Enhance>Enhance Lighting>Fill Flash. Adjust the Lighting and Saturation sliders and see if that helps.
Alternatively, make a selection of the figures, then select Layer>New>New from copy to get a layer that just has the figures on it. Then hold down the Alt key and click on the black & white circle at the bottom of the layers palette -- choose Levels from the dropdown menu. This adds a Levels adjustment layer associated just with the figure layer. In levels you can adjust over all brightness/contrast or work with individual red, green or blue channels.