Okie Dokie, here we go....
#1 It's level!! Excellent start. Without the walker, it would just be another typical point-at-the-sunset shot. You added something extra, which I think.... adds something extra. However, your losing a lot of exposure that far to the edge of the frame so the silhouette doesn't contrast with the background as much as I would like. It's good that he's juxtaposed against the much brighter water, but it's still quite dark on that edge. The main subject (the walker in my opinion, not the sun) should pop! I think the best solution is to increase exposure. You'll lose more detail around the sun, but hey, it's the sun. It's bright.
I recommend considering a non-standard panorama crop on this. I think that will strengthen the relationship between the walker and the sun.
#2 Level ftw.
Again I think you are a little too underexposed for my taste. But that's not what is bothering me the most. What is bothering me the most is that foreground rock that you clipped off and now seems 'attached' to your black border. I realize this is probably the edge of the beach, but let the beach create a natural border. Those small rocks emerging from the water are critical for this shot, but they are framed like they were an after-thought.
#3 Technically, there is one thing I'd fault you here, and the solution to it may solve another issue which is not technical. Because the camera is pointed above the horizon, you have slight perspective distortion, most noticeable on the right edge. Because it's such a small amount, you can fix this in photoshop with little degredation.
But more to the impact of the image. What interests me is not the window (which is the brightest part of the scene), nor the people walking (which is the darkest part of the scene), but the reflections on the floor. I would like to see this shot wider and/or portrait aspect so I can see both the window, and the awsome reflections of the light and the motion-blurred people on the floor.
I do think you chose a great shutter speed here. The people are individuals, but at the same time, they're all moving and busy with someplace to go.... I like how all but one of them are not looking at the camera, and the one that is looking is dressed differently. Not just differently, but he's wearing a white shirt amongst a huge group wearing dark. He stands out, which is neat. Good luck or good planning? I just wish I could see those freaking awsome reflections!!