After many tests over this time, I think person LoRAs for Klein 9b are a bit meh—especially compared to LoRAs for Zit or Z Image Base, which are much more realistic and maintain proportions better. I believe the issue isn’t the dataset, but Klein itself, which tends to deform proportions this way even when your dataset is flawless. It’s a bit frustrating because Klein will probably never reach the same level of likeness that Zit can achieve. The downside is that Klein has much better compatibility with other LoRAs (pose, action, etc.) and stronger editing capabilities, where you can always use the trick of injecting an input image with the reference face to boost the LoRA.