HMS Belfast - London landmark illustration

I've been working on some more London Landmark illustrations, the latest to be finished is this one of HMS Belfast.  I try to take lots of photos when I'm in London so that I have something to work from.  My most recent ones I've tried to feature people as well as capturing an interesting composition.

Of course everyone likes to show the work that goes well, but it's not always easy drawing things that are instantly recognisable by others.  I've been trying and trying this week to draw Tower Bridge, so far I'm just not happy with it.  I'm going to put it on the back-burner for nowand come back to it another time when I'm not so bogged down in it! 

Please let me know what you think of my latest illustration or if there are landmarks you want me to try next!