Hello,

If you are thinking about the Sign-in Account Picture, that's part of the security features for sign-in familiarity, that's not transferable attribute, meaning you are not able to directly invoke it from any profile, the only way you could send this kind of information would be to send bae64 encoding form a picture in a custom attribute or existing profile attribute, of course this would have to fit the attribute max value limits, you can check a base64 image converter to check this out, this would be the only way I assume this could be done, basically a custom attribute, with base64 image hash, send as custom saml attribute.

Best Regards,