Levels/Curves Correction

I took 5 images that were either under or over exposed and worked with them  by adjusting the levels and curves of the images in photoshop. Here are the five:

1.

(after)(before)

2.The was underexposed

(before)

(After)

3.This was underexposed

(Before)

(After)

4.This was overexposed

(Before)(After)

5. This was underexposed

(Before)

(After)