Is it my imagination or did some of the models change looks? Rachel and Evelyn sometimes look off. Rachel especially during the Red Maiden contest sequence outside of RM.
Yes, sometimes characters look different between scenes. Characters received a visual upgrade at some point; many scenes still contain old renders, and the difference between the characters' appearance in the old images and the new ones is huge.
Old renders are slowly being replaced with new ones; remakes of renders are made when content for a given character is updated. Jennifer recently received a remake along with her update, for example.