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Also, even now, your message could be thousand times encrypted - Google drive backups are not. At least by default. Don’t know anything about iOS, but probably same.
As far as anyone knows WhatsApp uses secure end to end encryption. So only your device and the other person’s device has access to the picture.
The only downside is that WhatsApp is a closed source program, so it isn’t verifiable that the encryption is correctly implemented.
Also, even now, your message could be thousand times encrypted - Google drive backups are not. At least by default. Don’t know anything about iOS, but probably same.
iOS WhatsApp backups can also be E2E encrypted, but I don’t believe it’s on by default.