Merge down all the layers now: Layer ? Merge Visible (shift+ctrl+e) and make a copy of the new made one (ctrl+e). Next we have to blur it out, using the filter shown here: Filter ? Blur ? Gaussian Blur.



Change the layer's Blending Mode on Overlay and don't forget to minimize the Opacity till 32%.



We have to insert on a new layer a thin frame, selecting previously the Rectangular Tool.