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Some may decide based on how the image is going to be used. menarabet Or you may decide based on what kind of image you want to make (portrait, landscape) We typically use 1:1 or 2:3 a lot for Stable Diffusion on Civitai, but there are alternatives For example, 4:3 or 3:4 is used in medium format photography, and 5:4 or 4:5 is common in large format