1 - I see where you were going with the framing of the bridge, doesn't work though - the bridge is too small to be the subject. The colors of the sky are good, the exposure is fine. Having the entire foreground in silhouette would help, but the framing is all wrong, way too crowded.
2 - Flat, boring - the bridge as a subject sweeping center stage is boring. Once good aspect is having the sun framed between the pillar and the cloud that's mimicking the shape of the bridge pillar and cables. I think a better crop would almost be to crop the image in half keeping the right half with the symmetry
3 - What's the subject? Branches 'frozen' in center are distracting. If the photo is about motion then that's fine, doesn't fit with the bridges theme.
I think when asking for a critique it helps to know what the photographer was going for. Maybe you're trying to express speed and motion in that last photo, or maybe you're just off on shutter speed 