The only thing that I can think of that might seem a bit off is that her eyes have slightly different shapes and she goes a bit Ô_o. But I still think that this is a gorgeous piece and you should be really proud of it Awesome job.
Yes i think ive seen what image u used. Ur image it looks more like she is lying back instead of sitting upwards. Which i think would give the hair more of a fluff, which i think u did well As for her looking like Lightning... i think u did well. I mean her hair is a distinguishing trait of hers. And it looks great! That along w/the entire image would have allowed me to realize it was Lightning even if u didn't title it