The use of a lora character is indeed the base for having some consistent characters. second thing which i use is the "seed". u can try to fixe it and generate in batch 2 or more to have multiples images which will share the same seed. u can just edit the prompt and it will change it using the same seed, so u can manage to make small changes, such as a character blushing, smiling or some other small changes. And u can increment/decrement to stay in the same "zone". This is in comfyui but seed works the same everywhere
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my 2 first pictures share the same seed, i just changed the view
and for constitent environment just play with the strength. Like "white_walls:1.1" even more if u got a complex environment. remember that's it will impact ur character, hair color, eyes, outfits. so this must be made accordingly. usage of neg prompt is also useful when u want to control everything.