@Shinjidude: I think it depends on the image's layout and...

Shinjidude
2010-03-10T02:54:16-05:00

I think it depends on the image's layout and format, for things like oekaki, lowres is typical and fine. Where it's a resize of a larger and more detailed image or an obvious thumbnail it's a red flag.

Replace jpeg_artifacts for lowres in my example, that's a more unambiguously negative tag that we maintain.