thanks for the comments.
number 3 and 5, i didn't actually know the wire was there when i took them. was standing on a fence with the camera balanced on a post. i'm gonna head back up there soon and try and get it to focus on the wire.
i'm a newbie at processing, what would i be actually adjusting if i played with the saturation (contrast, brightness, colour curves etc i know - but not saturation)
with number 2, my eye is always drawn to the black bit near the centre. not really sure what i could do affect that?