I like the sky in the first one. If only you had a more interesting subject than the corner of the house. Its really not that bad though, decent composition.
Lack of an interesting focal point for the image. Pictures of skies are hard to pull off unless you have something to "ground" the viewer.
The third are some shoes/boots. Not much else to say
The fourth, well, I can see what you were going for, maybe getting a dog in the background. The picture is a bit soft