NO – a picture is NOT SPAM by itself. If somebody sends you a picture why would that be SPAM? SPAM is emails from people you do not know and typically either come from an impersonator or a “do-not-reply” email address.
Impersonation we can solve with sender verification such as SPF.
“Do-not-reply” is an oxymoron – why do you send me correspondence i cannot reply to – monologues are for soap boxes.
If an email from a friend goes to SPAM because it had a picture embedded the there’s something wrong with the filter.
When can we get to the day when WE decide what’s SPAM and what’s not – why do we have all these robotic filters making up our minds for us based upon such faulty logic?