Click Image ---> Adjustments ---> Treshold. déplacer a little cursor to increase/decrease visibility.
Click on your background image on the panel on the right and instead of normal choose screen,lighten ou similar.
Before toi do that, toi need to unlock background layer. You're going to do that par double clicking little lock on the background layer. Then add textures.
In this Elena photo, I used a link link posté to this spot.
You should have something like this.
