Press on the Alt button and click between the layers, while the Alt button is pressed. This way the mirror-copy will be transformed in a mask of the basic layer.

Set the Soft Light on the layers.

Select the next tool and represent on a new layer (4×4 px) a texture’s cliché, colored in BFCBD9.

Save it!

Create a new layer and apply on it the earlier saved cliché.