You have some interesting photos.

Pic.1: it will be better to crop out the upper unattractive sky; the photo would be more impact if the person weren’t so in the centre.

Pic 5, a nice composition, you need to get rid of those dirt marks ( ?) on the photo.

Pic6, a more interesting one, again it would be a better photo if the upper unattractive sky were cropped out a bit.