When I think "technical", I picture lots of big rocks and/or roots or really any obstacle(s) that requires some thought and skill (mostly balance and bike control) to ride (or walk) over/around/through.

If we're going to define "technical", maybe we need to define it in terms relative to the rider instead of actual features. Most any trail will seem technical to someone who is a new rider or has only ridden on the road.

TacomaSailor, in that second pic do you ride straight down (through the arrows) or does the trail zig-zag?
The bit up top looks like a drop to me, assuming you ride straight off where the arrow points. I would call any downhill part of any trail a descent.