Ensuring facial consistency in GPT-4.1 image editing

I’m encountering an issue with GPT-4.1’s API image editing capabilities. When I input a Santa image and a background image to create a composite, the Santa’s facial features appear to adapt or change based on the specific background. How can I fine-tune my GPT-4.1 model to ensure the Santa’s face remains identical, regardless of the background image used for the composite?" I have a training set of a bunch Santa’s that all have the same face.

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