I'm not a studio expert, but there are some things here that seem weird to me. First, her pose seems little weird, like she is almost squeezing her head between her palms.. the wrist on the foremost arm looks awkward. As well, there seems to be almost too much soft focus. (this is personal preference, so it could be just me!) And I like the black as a background, but would have liked it to be solid. Over her other shoulder it turns to white.
Keep trying things out, and posting them here so we can help! Usefilm is great for learning!
I think you've got really nice light for her hair! Looks very natural and has nice highlights!