It is good. THe tones and composition are great. It's just the hard shadow from your flash. When taking portraits with a camera mounted flash, it is usually best to bounce the flash off of a reflector or even the ceiling or the wall. Automatic flash units with ETTL flash exposure make this as easy as simply rotating the flash. Manual flash units can do this as well but it does take a little thought, I add up the distance from the flash to the reflecting surface and from the reflecting surface to the subject and then use the gauge on the flash and then, bracket the apeture..
Any way it is a great portrait just wanted to offer up a way to avoid the shadow,,,
Before you blow it up, you may want to fiddle with the contrast and levels, it loses some detail because of low contrast and not enough darkness. Of course some of the angelic charm is captured by this very light bright quality, so maybe it is well-balanced, but it doesn't 'pop' yet, at least on my computer screen I would like to see some more depth of contrast and levels adjustment. (use the bunny's fur texture as a guideline)
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