I'm no expert on Photoshop, however I thought I would make a quick and dirty try with the pix you posted...here goes:

When a subject is backlit, it's good to have fill light in front of them.

Outdoors a UV filter helps keep the blues truer.

Wow! With the right contrast, she's gorgeous.

Fill-lighting again.
Curious to see how other's approach these pix.
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