Marcela Bolívar is a photo-manipulator and digital artist that I scouted on deviantART, I believe I came across her gallery when she received a Daily Deviation or so. Though I don’t quite remember.
Anyways, her gallery is quite the worth looking at. Unlike other photo-manipulators; who just cut and paste random objects into their photos and call it a photo-manip, Marcela Bolívar does a great job at what she does, and that is photo-manipulation.
Her dedication and hard-work can be seen in the below shown photographs, to see more of her work, check out:

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Ash III
Ash V
Astray
Dissolution 1
Dissolution 3
Fabulae Dramatis
Gorgona
Leda
Medusa
Mercury I
Songs to dust
Sulfur I
Sulfur II
Sulfur III
Sulfur IV
Sulfur V