Lets make a little noise - On more or less quantity, all my work i tend to have some granule or noise. It is something that I like to add, as it makes the image feel less "cold" and gives it a very pleasant"imperfection touch". This is the process that I followed for this image's noise:

- First, we create a Overlay layer over the rest of the layer. We fill this layer with grey colour with value RGB:128. With this grey tone, the layer will be completely transparent.

- Second step, we apply the Add Noise filter. In "Amount" we will put the maximum value: 400%

- Third step, we apply three time the filter "Brush Strokes-Spatter", obtaining irregular shapes and stains on the initial noise.

- Forth step, we apply the "Blur - Blur" filter for getting the shapes to be less hard.

- And the last step, we adjust the opacity degree of the layer, on this paint is 7%, a high degree as I normally use 3% or 4%. On this particular case I also added a transparency mask, for making the granule more subtle on some zones, for example the characters face.