Other than a few photographs, easily forgotten because they were "calendar shots", I have no knowledge of Le Mont St. Michel. Actually that's not entirely true. I seem to recall a mystery novel where the victim was killed by the incoming tide, being unable to escape to land quickly enough.
Anyhow, I've never seen the place in real life, so I have no idea how enchanting a locale it might be. I guess I'm trying to say that I don't have any preconceptions about the site to bring to my viewing of the photograph. For that reason I'm not bothered by the lack of definition. I think others with a more intimate knowledge of the place are affected by their memories.
So, removing that consideration, when I look at that photograph I'm not bothered by the contrast between the foreground and the background. I'm left wondering why this almost mythic structure is fenced off. So, for me, that part works okay.
One thing that does bother me a bit is that the gate doesn't seem like it's part of the scene--it looks a bit as if it were composited in. It doesn't seem to be grounded in anything, almost like a frame. And I don't know how you'd fix that.