Sadly natively WP doesn’t allow to set custom default avatar in settings, just choose from fixed selection of options.
Avatar retrieval is handled by get_avatar() function, which accepts third $default argument to which you can pass URL to desired default image. You will need to edit your theme to accomplish it in that way, or (going even deeper) to make use of its internal filters.
I would first do some searching for existing plugin to accomplish this, it seems like typical need so there is bound to be one.
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