Photo Editing Question

[camjam]

It was cold and snowy here yesterday and the phone wasn't ringing much and I started looking thru last summers pictures trying to remember spring and warmer temps will eventually come back. I came across a photo I really liked but the photo is under exposed; photo was taken early October at mid day. I spent some time editing the photo in Photoshop Elements 9, but I am stuck on how to bring back the color of the trees and house in the back ground.

Is it possible to bring back the fall colors of the leaves in the back ground and are the changes I made so far acceptable and not over done?

Original photo straight from the camera

Changes/edits done so far