Well, the picture is definitely to dark. Let's fix it. 2 Begin by copying the original layer.
Screen is a lightener.
3 Hold the Ctrl key down and select at the bottom of the layers palette the Create New Layer button. Select Levels for your New Adjustment Layer. I've set the middle arrow to 1.46. 4 Follow the same method of creating a New Adjustment Layer and select Curves this time. Curves allows you to make further adjustments to the light and shadow areas.