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You could try ComfyUi with Krita AI extension if you want to go further. ComfUi is far less ressource-hungry on your GPU and you may even be able to use SDXL models for correct morphology and better realism. ComfyUi is quite difficult to master compare to SD but with Krita software extension, it is really easy to use (as ComfyUi is running in background) and you will be able to fix all the imperfections as if it was nothing using the inpaint tool.
As I see the comments above about the girl face consistancy, no so many choice. You can train a lora model yourself (with Koyha_ss for example, but better rent a server for this if you don't have a 2000$ GPU) or you can use ControlNet. I think if you manage to generate one good quality picture of your caracter, you may use it as reference with controlNet to do faceswap.