Hi Pitty,
As Monika has said, Firefly Image 2 (current version) is not able to give variations of the same character in different situations. Maybe in future versions that will be possible. For now, every time you generate an image, even with teh exact same part, there a high level of randomness which means a unique image every time. You could upload a reference image to try get some similarity but that would not be a full solution for what you are after.
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