nice shot, and nice framing of the man in one corner and the cannon in the other which leads the eye into the picture. His face is perhaps a little dark, and it would have been nice to include his feet.
I think this would be much better if you had a closer perspective to the person. Framing this from his chest up, with the buildings directly over his shoulder would make this much more dramatic.
Louisbourg is amazing. Good exposure and colour however, I think the guard would be much better if he had feet and was maybe standing on a bit of an angle facing into the frame of the picture. ;o)