Belém Tower(1) - Tagus river

This photo documents the existence of the tower. However, I don't feel it expresses anything about the tower or the experience of viewing it (this is just my opinion).

I would pick a point of focus on the structure (perhaps the light in the tower, or the water line) and experiment by cropping the image, or reducing your DOF.

I would probably remove the plaza on the lower right, I think it's distracting from the subject. Also, the lines of the structure are uncomfortable in this photo...that's something I would explore in this subject.

Taken at another time of day, you could experiment with the relationship of the tower to its environment. Against the black sky and dark water, though, this is a photo solely about the tower.

Keep Shooting!