Merging images like so

i’ve noticed that this technique get used a lot. (merging 2 images together so the look indistiguishable, in this case eminems face and the drugs).

basically i want do something similar with a little project i’m doing. how do i do this?

Do some research on clipping masks. That seems like it would be relatively easy to do with time and effort.

looks like just two images, change the layer style of the upper layer to multiple or hardmix