Nice portrait. Try not to center the subject so much and try playing around with the some adjustments layers to alter hue/saturation and maybe even the levels to darken up the image.
Excellent portrait. Personally, I think the levels here are fine - any more contrast would risk making the image harsh. The only thing I might do would be to crop the right side to the point where the edge of the model's arm meets the bottom border.
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Thanks for the comments guys, I will try cropping as Tamlin suggests, it'll take care of the centering. The only editing I do to my photos is to use autocontrast