That arm looks really off... it looks like it's missing the entire upper section.
It's just the perspective and colours messing with the depth of the picture, I feel.
My revamp of Xanthe, I took the criticism given, and reworked her. Ultimately, I wasn't happy with her bust either.
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Nice, they're a massive improvement over the old one, which looks quite odd to me and others. Good job, Shou.