Here a technique the photo-shop guy (No pun intended ) at Memories taught me to brighten up dark areas in your pic. A more controlled (non-destructive) form of adjustments->brightness
1) Press Ctrl+Alt+Tilde to select the highlight portions of your picture
2) Select->Inverse
3) Edit->Copy
4) Layer->New->layer
5) Edit Paste
6) Under layers change type to screen and adjust Opacity to get a realistic look
Example : Before
After
1) Press Ctrl+Alt+Tilde to select the highlight portions of your picture
2) Select->Inverse
3) Edit->Copy
4) Layer->New->layer
5) Edit Paste
6) Under layers change type to screen and adjust Opacity to get a realistic look
Example : Before
After