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Potentially a very nice double portrait.  Technically the dark areas are too black.  Any dark area that measures RGB levels below 20 will have difficulty displaying detail.  Much of your dark areas measure 1-5 and thus you have blocked, no detail areas and little subject separation from background.  I used the shadow-highlights image adjustment in photoshop cs to restore some separation and the illusion of detail in the darkest areas.  I dodged the horse's eye with the highlight dodge to return detail there.  I hope this helps.  Good luck in the future.

no, i prefer the original one. the black add more than something to this image

Although I can understand John's need to modify , I too prefer the original , it is much more dramatic . Great shot . Bill