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The 4th seemed to capture a bit closer to, not only a decaying boat, but a boarded up factory (the height and closeness to boarded windows makes it seem more poignant to me). While all four are good, the others are closer to simply an old boat that was irrelevant long ago. Number four is that way a bit, but seems to reverberate with maybe a slight bit more recent loss. Tough call though.
I would have liked to have experimented with a person leaning on the building looking to the side and deep in thought, but maybe it's too late to play with that.