Studio-Quality Group Photo Retouch

I have one group photo that was shot indoors on a mobile phone with a strong light source behind. The back-lighting washed out the faces and left the scene looking flat and amateur. I need a skilled Photoshop... (Budget: £10 - £20 GBP, Jobs: Adobe Photoshop, Background Removal, Image Processing, Photo Editing, Photography, Photoshop, Photoshop Design, Visual Design)