Yes, that describes it pretty well. By default the random seed is different for each generation, so even if the prompt and every setting is the same you'll get

Yes, that describes it pretty well. By default the random seed is different for each generation, so even if the prompt and every setting is the same you'll get vastly different images ( which is the expected outcome ). When you set the seed to a fixed number you get the same image every time you generate if all other settings and the prompt are exactly the same. So I start off with a pretty high CFG Scale to give it enough room to imagine things ( Refiner and Resize turned off ) Once I have a good base image, I'll send it to img2img and iterate some more one it.