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 (
4x4 px) a texture’s cliché, colored in
BFCBD9.

Save it!

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