Decent tie, but focus seems a little soft & colors/contrast a bit muted. I'm pretty much a newbie here, though, so take my comments with a grain of salt - just 'cause I'm being critical doesn't mean I think MY stuff is doing any better! Good luck!
4 - Nice capture and composition. More height plus 640 width (if not height as well) make this even better in my opinion. Your call (obviously), but perhaps this shot might have looked even better with a toning/something effect, especially given the difficult contrast/etc issues.