Newest Rule:
Do not post directly to videos relating to the plot of ArcSys games (Arcade/Story Mode, etc). The exceptions are posting an official video (ArcSys themselves, Famitsu, Dengeki, etc), or a LIVE stream from an arcade (do not post to a twitch.tv archive). Much like with music, ASW isn't the biggest fan of these things floating around the internet. Screenshots are ok until ASW starts cracking down on those too. But for now yeah, screenshots seem to be ok.
If you are posting a large string of images, please collapse them using the [collapse = "something has to go after this equal sign and you must delete the space before the equal sign"]your content goes right here[/collapse] tags. Using the new Dustloop's spoiler tagging also works just fine.
Don't do attachments. Attachments diminish image quality and are a hassle to edit if need be. I will remind a user to not attach images if it's a first offense. If repeated, they will receive a warning. I will never infract over (SFW) attachments, but repeat offenders will have posts containing attachments indiscriminately deleted. Use an image hosting site to post your work.
Regarding Official Art threads (BB's in particular): They are not story threads, nor are they general chat threads. They should be for images, comments on the images themselves (not what the image "means" in your opinion), other official works, questions, and other topical posts. It has become harder and harder for users to find art or work in the thread as more space is used up with idle chat. So no more of that, please. Discussion of images may be taken to an appropriate thread so long as it's actually appropriate. An image that has no context does not belong in a story discussion thread. Nor does an image whose only context is a plausible name attached to it.