Reprocessing, is this necessary?

From Photo_2014

Last year, I made ​​a lot of shooting in nature, the south coast, Mount Bromo and Yogyakarta. In the last 6 months, I observed the results of my shots look less good, although I’ve been using a Nikon D800 and a fast wide-angle lens. I learned a lot from the shooting, mostly an error in the post-processing stage.
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