#3 - good contrast (the highlights don't blow out like in #4), the walkway leads you "in" for the shot without taking you up the middle - which isn't bad in and of itself - but your eye keeps moving for #3 once you're in there. And - in contrast to #1 - you've filled or cut out the "blank space" of just clouds on the left very nicely. All well done in general! -Lew ;-)