Should I jump head first for maximum success chance?

[2nd Zed]

I've been thinking about the jumping method a lot recently, and I'm getting more and more ready to do it. I have access to a 15-story building, so height is not a problem. I'm not sure HOW should I jump, though. Some sources say damage to the head is the most important. Does that mean I should be jumping head first like on the pic?

 

[ryla2090]

Yes, the height is more than enough, so that shouldn't be a problem, and headfirst would mean guaranteed lethality. Did you take care of everything though?