You can flatten the PSD into a JPG, and then duplicate the whole LO and change the blending mode to screen, then fiddle with the opacity until it looks good. Hope that makes sense!
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Sarah 
Equipment: Canon T2i (550D) with 18-55mm f/3.5-5.6, 55-250mm f/4-5.6, 50mm f/1.8, and 400mm f/5.6L lenses
Software: Windows 7, PSE 6.0 (Editor and Organizer), and PSCS 4
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