I like this shot quite a bit, being an IM Pei fan, but I wish the edges of the lower pyramid were visible and just a bit brighter. If you could bouced a bit of flash onto the stone with out picking up the reflection in the hanging glass, you could have brightened it and dimished the lights from the shops in the backround. All that being said great composition and subject, nailed the challenge, top ten. I have a silly picture with my eight year old daughter with her head between the two points from when we were there a few years past, thanks for the reminder, Ill have to dig it up.
That's different. Would have been good during the Abstract challenge. It's difficult for me to rate because I don't know what it is or where to really look. There isn't a main focal point IMHO. The faint lights in the dark BG are a bit distracting as well. Sorry I couldn't be of more help, but since I don't know what it is, I can't really offer suggestions on how I would improve or change it.