I've been speaking with my publisher today, and they will be doing a new jacket for Magic Under Glass. I will post images when they become available, and I’m looking forward to meeting a new Nimira, hopefully with the same lovely mood as the previous cover. Bloomsbury posted news of this decision on their website: http://www.bloomsburykids.com/books/catalog/magic_under_glass_hc_306.
You may have seen my vision of Nimira in my book trailer. I hadn’t shared this image with Bloomsbury at the time the cover was originally conceived (the trailer wasn't created until November, after the book was done) but we’ll now be looking at models who look more closely like her, which I'm very excited about!
*edited to expand on some of the concepts in the original post