No.1 I think would have been better in landscape format, it seems a bit cramped
in the frame and I think if you had kept it at that focal length but landscape you would
have had a better composition.
No.2 Doesent really work for me, not enough in it to keep me interested and the mountain
is quite dominant but cut off at both ends.
No.3 Is a quaint little cottage and looks very pretty with the snowy surroundings.
Agree with the comments above, nice pictures but the colour being enhanced a bit, try increasing the white balance, on number one I would either clone or crop out the branches on the right and reduce the amount of show in the foreground. Number three is nice, try straightening it a bit. The shots show this off as a beautiful place, would love to have been there!