This image has a strong central figure, but you could have improved the composition by following my favorite photo rule:
Compose your shot, take two steps forward, click the button. Maybe in this case, gotten on one knee and composed. She's elegant, the thing she's on is interesting. The problem is I see that wire, I see the city, I see the guy, the clock tower.
Another aspect is the darkness. In a silhouette, things shouldn't just be dark. They should be almost wholly black. The silhouette is interesting because of shape, not the details. You captured a great silhouette but it was an "almost" great image.
Nice feel. A wonderful rendition. Wish I could see your model's feet. The tall statue seems to divide the picture at that point - while the clock towers is very nice it's hard to get to. The other human figure below the clock tower adds nothing to the image for me.