Textures are a fun way to add depth to your photo, using layers with soft light, multiple or hard light. Experimenting gives all sorts of interesting variations, I chose to use the given examples and here is what I came up with.
This is a plaster hand Jeff produced for an art class piece.
I do find it strange that most of the time photo manipulation is to reduce lines and blemishes to get a pure picture and then here we are adding them!