I seem to remember reading that "Big Ben" actually refers to the largest bell in the clock tower, not to the clock itself, though yours is the common usage.
Fills the frame for sure. :D If this wasn't so grainy, and had more contrast to it, it would have a good chance of doing well. As is, it's a bit below average IMO. Good luck to you in the challenge.
Sorry, i'm going to be a real bore on this one. This isn't Big Ben, this is St. Stephens Tower. Big Ben is the large dong bell.
This said, i do like the picture with the lit top tier and the left offset face. 7