Note bleeding from orifices. Replicating small caliber gunshot wound to the head. and ecchymosis(bruising) in the soft tissues. This is strictly make-up I did on myself in prep for a shoot.
The key to getting SFX make up right is understanding both the timeline and mechanism of injury. As a former Paramedic, I have had the opportunity to see injuries of every magnitude, location and age.
One thing that is really absent in many films I see, is the proper skin tone. Someone with a major gunshot or stabbing will soon exhibit a pallor to the skin. And blood that has dried.