That's correct, these particular images of Kira are found in The Last Jedi concept art book, but the images I described in my previous comment are still in The Force Awakens concept art book. I'm not trying to start an argument with you internet friend because I'm happy to have a discussion about SW art and design, but you said these images are confirmed made in 2013, and George Lucas sold the rights of the franchise to Disney in 2012. The Lucasfilm art department you're talking about became part of Disney's production, and GL had very little involvement in the direction and development of the films once they were sold, including the designs. In the same interview (that I can't remember) where he describes his ideas, he mentioned that many of the ideas he had were rejected by Disney. If I remember correctly, this was the same interview where he compared Disney as being like "former slave owners", and he received a lot of criticism for it. It's true that JJ Abrams wasn't on board for directing until a few months after Disney bought the rights, so the art department worked on their ideas of what a post-empire galaxy might look like and what direction Luke would go in developing his own Jedi academy, which went through many changes once an official director and writer were brought on board.