Merge down the layers containing the girl and the shadow (ctrl+e) and decolorize the picture with Image - Apply Image.



Correct a little the girl's brightness and the contrast, applying Image - Adjustments - Levels (ctrl+l).



Insert on the picture several birds, using the Brush Tool. The necessary brushes may be downloaded here: http://www.deviantart.com/deviation/15235233/
?qo=91&q=by%3Aspiritsighs-stock+birds&qh=sort%3Atime+-in%3Ascraps.



Open in a new window the picture representing a small window.



Cut it out and insert it on a new layer, above our picture, minimizing firstly the size if that is necessary: (ctrl+t).



Decolorize now the window (Apply Image) with the same adjustments we used earlier when decolorizing the picture. Create a mask out of this layer: Layer - Add Layer Mask - Reveal All. Then make use of the Brush Tool of black color with its Hardness of 0% and hide partially the window's edges.



Apply after that the command Layer - Remove Layer Mask - Apply, change the layer's type on Color Burn and correct the Levels (ctrl+l).