Way ta Go, Shacklemeknot!
Nice targets! Great advice, too! I liked the part about repeat shots.
For would be or never again victims, though:
I had a police firearms class a year ago with the target on the top in a 'running movie' with Glocks configured to shoot a laser beam and record where you "hit."
I hit the bad guy with the knife - right through his left eye - and was asked why I shot. "Because I knew it was more likely I'd kill him than him kill her that way" was the answer. Quiet room that day.
Anyway, yeah, is that even looking at the K5 zone on a silhouette target, people move around a lot - even ones who really need to be shot (somebody ELSE figure out WHO that is). Most won't hold still long enough for you to draw a bead on a really good target area, and just maybe you'll be excited, too, so most police and military train for center of mass targets and hope that when it hits the fan, they'll be able to hit a K5 area somehow. Bad guys like cover and concealment as much as you do. People involved in gunfights also tend to shoot high. Aiming for that center on the silhouette is a good thing to train for. Head shots are fine if you can get a solid one - they gotta sit still, you have to aim well, and it IS possible to get say, a .22 slug at the wrong angle and have it glance off the skull. Chances are, though, you won't have a lot of time to contemplate and lay out your best target.
If you're up for it, see if somebody in your area has a community college that has a police firearms course. Just going from the command to "draw!" and try to hit a huge silhouette target is way harder than hitting bullseyes at a regular pistol range. Study the anatomy - and practice. A lot.
A great thing about repetitive training (like the Force on Force) is that you learn what works, what doesn't, and can train to a point of confidence - something very, very few folks ever do.