To enhance your image’s lighting, you may want to try running the Auto Tone, which will brighten your image, and add a some contrast.
You can apply the Auto Tone non-destructively by creating a Levels or Curves adjustment layer, then click the “Auto” button in the properties panel.
If you would like more options, Alt-click (Mac: Option-click) the “Auto” button to bring up the “Auto Color Correction Options”, and choose from the different algorithms.
In CS6 and newer, the default will be Enhance Brightness & Contrast. In older versions of Photoshop the default is Enhance Per Channel Contrast.
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