I think this is an amazing piece. I like the way the blue stands out and I like the way the orange background compliments it. She looks very realistic. The way you stuck the beads and other pieces of metal really made it pop.
One thing I thought could be improved was adding more depth and shape to the areas that were blue. The hair and the suit looked flat to me. I think you needed more apparent sharp highlights and shadows to emphasise the shape of the clothes and the hair. The composition also struck me as a bit too narrow - I think it might have been nicer if there was more area around the girl.
this is amazing work, Astrid! The colors are just stunning and bravely done. I'd love to see this in person and see the sheen effect you mentioned. And the pose and expression are brilliantly captured, too. Amazing, again!