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This is a good first attempt, Lin. Next time, though, I'd try to paint a little bit more, and do a little less copying of Christina's concept image.
AWESOME lighting! You're doing much better. I'd disregard Fernando's comment if I were you. Here's why. Any "art of" book will show people's paint-overs on top of either 3D models or other art-pieces. Certainly great practice, and you've gotten much further on this one. Keep going. Keep painting. :-)