Yeah, I always do it the way Jules Cho is shown in that other photo ... but I can't tell you how many times I tried it this way before I learned my lesson. Hey, at least you got a GREAT photo out of it!
I got the angle by leaning hard backwards on rappel with a 16mm lens. I was practically horizontal, holding the rope with one hand and a camera with another. Thinking about it, if you attached something to your shoes (stilts?), you could get really interesting angles.