Fun shot. I like the subdued feel of the lighting and I even like the expression on the model. Doesn't look stiff or uncomfortable. The position of the hand is a little awkward and it's a bit brighter than the rest.
This is certainly an interesting image...it's probably a bit more of an obscure lyric than most voters would be familiar with, therefore it requires more thought than some of the other "in-your-face" kinds of entries with lots of wow and gloss. Your lighting works well, but I think voters would rather see a bit more on the face and probably less on the hand...the brightest part of the image is where the eye is naturally going to fall, and her hand isn't really the subject, so it distracts. The background is a bit distracting as well...a greater DOF and perhaps moving her away from the background more would decrease it's distracting properties. The monkey...well, to be honest, toys rarely, if ever, do well in challenges, no matter how much they meet the challenge. It's just one of those DPC things. ;)
Still, all that said, a 5.3 is not a bad score and I think you placed about where I would have guessed. Keep shooting, and let me know if you have any questions. :)