Anyway, so, I would either have to make some sort of fill in the silhouette, to act as a rudimentary healthbar, or just rely on colors. I didn't think either of those options are that good, but let's see:

+ Great visual indication
+ Fairly easy to tell at first glance
- Not AS easy to tell the percent damage as rectangular healthbars, but this is minor
- It's still a little confusing why one can die with your legs being at full health
? Need to see if it's possible to give more rigid and obvious limits to what's 0% and what's 100%
I guess you have a good point, I didn't think it would work that well, but it seems to be actually not bad..