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I don't think any of these are too dark, but I do think that the top two are too tightly cropped. The bottom image of the seagull and fisherman is good. Your view point on this shot gives me the feeling of crouching down and peeking into a scene, and the scene is good. The Seagull flying above and the fisherman getting another line ready (or so I can imagine) makes an interesting image.
The two top images are pretty scenes and while they still look ok I think opening up the frame a bit so the boats are not looking crammed into the shot would help.