SF Match photo - is there a required aspect ratio?

[SphereGlobe]

Does anyone know if our photos have to be a certain aspect ratio (eg. square, vs 1-2px width/height) or if our photos be squashed if they aren't the right size? I'd like to look somewhat realistic in my photo, though whether I do may depend on the technology. I tried emailing SF Match about photo requirements but they weren't very helpful.

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