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3 and 4 work well for me. One thing that differentiates these two images from the first two, is, to my way of thinking, less conflict between the foreground and background elements by choosing your focus better.
Let me explain.
In the first, there is nice detailed view of the iron structure of the bridge on the right. But the eye is pulled down the bridge to the pedestrian. And it appears that the DOF falls off, less sharp in the distance. Just where the eye wants to go.
The effect/conflict is greater in your second image. You have a play of repetitive elements with shallow DOF. Fine and appealing. But the position you chose also allows the eye to be pulled deep into the scene to the car and then the pedestrians beyond. Conflict between near and far subjects, sharp and softer.
3 and 4 dont seem to have that tension. The foreground elements are clearly blurred but provide context and framing, POV. The subject is clearly in the distance, nicely focused.