I agree with *Ehecod in so far that the water does indeed not look particularly much like water; however, I do like the overexposed top left corner. But I believe the shadow of the monolithic structure (which really adds to it (the object does)) does not have the correct angle; it should point more towards the viewer.
Since you've requested critique, I'll see if I can give some in the form of a comment-- though I'm obviously not even quite as good as you are, but sometimes the viewer sees something the artist doesn't.
So, I'd say that it's a bit too monotone. But if that's the sort of mood you were going for, then that's not a flaw at all-- that's just well done. However, what does bother me is the over-exposed left top corner. I just feel like it's a bit too bright and doesn't do well for the image. I mean, it creates a nice contrast with the darks but compositionally I would change that part of the image entirely, though that has probably more to do with preference.
Other than that, I'd probably work on the water. It doesn't really look like water-- no reflections, no stream, no nothing. ALTHOUGH, I'm realizing that it could very easily be ice (since it's a snowy environment, right?), in which case, well done.
It's nice. Kind of impressive that you got it to look good in a canvas that's shaped almost like a square. I feel like almost nothing nowadays works compositionally well in a square-ish setup. I always go for the "widescreen" style.