There are a lot of people that use filters and other image enhancing software to clean up their pictures. IMO one shouldn't do anything other than crop your pictures but seems like more and more people are touching up as well. As a buyer be informed what you are looking for and looking at and you'll be fine -- don't hesitate to ask the seller for a natural sunlight picture if it makes you feel better.
BTW - I'm not saying there is any enhancement on the photos presented but just offering up a perspective.
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