Original Picture
Step1:
Open your picture with Photoshop, press Ctrl+J to duplicate your image. When you are editing any picture you should always duplicate it and do all your editing on the copy.
Step2:
Click on Create new fill or adjustment layer as shown below.
When you click on Create new fill or adjustment layer the menu below will come up click on Brightness/Contrast
The Brightness/Contrast window will come up and enter the setting below. Depending on your picture you may have to increase od decrease the setting.
Step3:
That's it.
Original Picture
Edited Picture
More Tutorials: 
