#1: Doesn't work for me. Will the boat bump against the pillar?
#2: Could be good, but need space on the left side.
#3: For me the most interesting shot. Looks a bit like a riddle, a hidden message I don't understand.
I keep myself asking whats the relation between the couple, the boat and the tree and the mountain.
#4: I am biased here - I used to sail a lot of Laser and love that boat - so I like it.
Overall - I would reduce the vignetting.
If you need a frame in the image - a border to the outside,
it should be the composition, which keeps the image together.