What's wrong with these exposures?

[Greg McCary]

I'm not real concerned with the content of these shot but I would like to know how I could have made the pictures look better. I bracketed the picture starting a couple of stops underexposed and worked my way up. I shot at f/11 400 fuji film. Should I change f stop instead of shutter speed or what???? I think the third one is best is this as good as it could get. You guys pictures are so much better it seems.