Upload & Sell: On
Over analyzed thoughts:
#1 & #4 - the standpipe leads the eye out of the frame.
#2, the curve accelerates the eye to the right, then down to the standpipe and off frame.
#3, most pleasing to me visually - I find the curve less influential, perhaps resulting from lower contrast, and vision directed from the right downward, then back along lower diagonal upward - cycling around the image. Perhaps some cropped from the top would help balance better?