I think you did a great job overall, but there are a couple things I think that bug me.
First off, the color is a bit too on the yellow side, and there's some greenish hues in your highlights on the skin that make her look a bit sickly or unappealing.
Secondly, I feel like the major feature of this photo isn't the girl but the jewelry. I like when jewelry ads make the jewels stand out from the the image and make them look super crisp and shiny.
Granted I know this isn't the same lighting, but a technique like this where the jewels are brought out more would be super interesting for this photograph.