Of all of these edits, I think the sepia toned one is the only good one. The rest seem way too obviously edited, and I believe subtly goes 100 times further than a very obvious edit.I'd agree...the exposures on these, and the processing, is not quite optimum. I took all four images and brought them into Lightroom, and adjusted them for slightly different "looks". I did some minor rotating and straightening of the horizons on two of the shots.
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I rotated this one a few degrees, and went with sepia toning and a slight vignette.
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I did nothing to this shot, except to 1)alter the blues and their intensity, and 2)made some skin tone alterations.
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I cropped this slightly, lightened the blacks, and "dodged" her eye sockets a bit. This needed some "eye sparkle" from a reflector, or a tiny bit of fill-flash.
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I thought the tree in the upper left, with the sky tones, was distracting, so I removed the tree and sky, to bring the emphasis DOWN, away from the tree-tops, and more to the young woman. I altered the color, and lowered the clarity, to give a more diffused and glowing look to the lens flare/backlighting.