I like this alot. Composition is very good. I'm usually not a big fan of selective desaturation, however it works very well in this image to draw you attention to the couple.
Hmmm. Interesting. Non-conformist with the blurred people around the main subject. ;^) May come back to bite you with the voters. It's a cool effect and gives additional interest to this image...only time will tell. I like the desat, very clever in this situation. Your subject may be a bit small to get maximum impact from the voters (in comparison to all the motion around the subject). JMO of course. Good luck in the challenge.
taking a picture of something not moving isn't really stopped motion; it's just stopped. it's a nice (semi-classic) view of GCS, though it feels that to me the building is taking centre stage, rather than the non-desatted people. i do like that the people are almost dead centre (nice composition), but i think the selected desat doesn't quite work here; maybe the greyscales aren't dark or contrasty enough for max impact, or perhaps the people are just too small? 5.
I hate selective desat. There wasn't much motion to stop. So why am I giving this a ten? Because it is a wonderful image and a brilliant interpretation of the challenge.