I think it might be a case of less is more with this one, there's lots going on both in the foreground and distance so my eye darts around the scene and can't really find a main subject. I do like how you've used the chain, it's a great feature and adds nice depth and interest.
As for the B&W I'm not sure that the scene has enough contrast to produce a great mono shot as there's lots of very similar tones, the main contrast being the sky and seating on the harbour wall. I love Cemaes, it's a great spot, personally I've found it a tricky place to get a decent photo of though and yours is a better attempt than I've managed so far
Simon