Welcome; C&C per req:
1. A nice, if typical big-city nightscape. I like the angle and perspective here, but I think the image could be improved if the building on the RH upper edge were removed, and the dark area in the lower LH corner is a little bothersome as well.
2. This one would work better I think without the two tall buildings image right. It also needs to be leveled. Consider acquiring a graduated neutral density filter to help reduce the dynamic range of scenes like this; that would really enhance the sky.
3. This is a nice shot. I like the composition and exposure here, but I think it would work even better if you crop away about 1/2 the sky; the foreground is far more interesting, and having the far shore split the image nearly down the middle doesn't work very well.
Just my $00.02 worth - your mileage may vary.
~John