This piece of artwork is very nice, especially the mood created by the muted blue tones. I think the sort of impressionistic, rough appearance of it is very interesting and adds to the dreamy quality it has.
The sense of lighting is also very good and adds to the perspective, and the picture seems to glow in the distance. You have a very good use of different values, and I can see that clearly with the monotone color palette you used.
One thing I will say, however, is I am a little unsure as to whether there is a figure standing on the ledge more to the right. That isn't necessarily negative, however, because I suppose it could reflect whatever the viewer wants to see. That could also add to the dreaminess and impressionism the picture has.
Overall, I don't really have anything negative to say, very nice work! It drew me in!