Creation of thickness of peeled plaster.
- Right click on the layer with the room, select Blending options > Drop shadow.
Creation of wall's peeled effect.
- Add texture of peel into the new layer.
- Transform it.
- Change opacity to 30-40%
- Correct the edges just like we did it before.
- Change the layer of peel to Multiply from Normal in Layer palette.
- Change adjustments in Levels just like in the example below.