Gonna give you my opinion but before I do that, I would like to direct you to the Critique Forum, which is ideally suited to your question.  There are a lot of good people there, from various backgrounds, who will take a good, honest look at your images and make constructive comments on your work.

There's nothing wrong with posting your stuff here but, since I'm part of the Critique team, I'd be failling in my duties if I didn't tell you about it.

Anyhow, your pics...

Out of the ones posted (and maybe due to the teeny tiny mouse size of the images), the third version works the best, IMO.  There's a better overall balance of hues there, working to focus attention on the figure.  The first doesn't work for me because the background colours clash too much and the outside section with the gradient looks cheap.  The second one is almost there but the off white looks unfinished, almost an afterthought or "Oh, what do I do now?" sort of thing.  

The third one is the best by far because the black areas are simple, direct and not at all fussy.  Admittedly, plain black is a cliche now but it does work in this context.

Bear in mind, my opinion and a couple of dollars will get you a coffee in Starbucks. :)

Coppula eam se non posit acceptera jocularum.

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