I think many editing programs do have such controls I mentioned. e.g. the free Gimp has them (with many) or iPhoto (that comes with every mac) (with a bit fewer range)
sure, if the pic itself is good already, less work is needed.
(AFAIK somebody is writing an article anyway, so I should not elaborate here)
it starts with light during photographing. and the surrounding light/colours.
I prefer daylight. Sunlight is nice but creates unpleasant shadows sometimes or makes reflections become only white halo. Even a dull grey day gives better light than artificial (if you don't have many proper sources).
and the settings of the camera, at least choose clouds or artificial light before taking pics (white point settings are only neccessary at very specific pics/scenaries)
anyway, I can see the quality of a mini no matter how bad is it photographed (except blurrings of course
, but it seems that some don't get the deserved good comments only because the photograph doesn't look good. and that is such a pity!