Photorealism in Blender: Unlocked

Reality isn’t clean and neat – your brain requires a certain amount of randomness and dirt to make a distinction between a CG image or reality. In this tutorial, Scenefiller shares a few simple techniques to add realism to your scenes: randomly offsetting edges, using photos as textures, adding dirt to your textures using a stencil and adding ‘stuff’ to your scenes to fill them up.

Very informative, short and effective tutorials on this YT Channel. THX Bart.