When it’s of an illustration according to Flickr.
Monkstyle.net who’s been posting illustrations to Flickr says:
I noticed a while ago that when I searched for photos using tags on flickr, that my photos weren’t showing. After checking through the Flickr faqs I discovered that this is because I have been marked as ‘NIPSA’ [Not in Public Site Areas] which means that my account is more or less hidden to people searching flickr for photos.
Flickr told him:
Flickr is a photo-sharing website, so uploading non-photos will flag your account as NIPSA.
So if you take a photo of your illustration and upload that will you be NIPSAd?
Anyway, it tarnishes Flickr’s warm and friendly user experience in my opinion.
Via Boing Boing