There aren't any rules, so it's up to the user. You can over do it when it comes brightening and enhancing.
I have slightly brightened a few images I've done, but only because it's shot really dark and identification is hard. I try not to mess with the colors if I can help it.
If it's a question of who has the better screencap, post both of them up on the discussion page and let other users decide.
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