So, I was working on a thing related to this (didn't get too far) but MAx said I should go ahead an post it here:
Tags
Tags are how people find images on KYM. relevant tags make finding a copy of an image within a gallery with thousands of images much easier.
Tag DOS:
Add the name of what it’s from (what is the name of the show/ comic/ movie, etc.)
Tag characters in the image.
Tag memes within the image.
If there is a phrase that is being parodied, add the original phrase to the tag list.
Tag the name of the artist if it is a piece of fanart or the creator is well known.
Tag DON'TS
Only tag the entry name (this is functionally the same as having no tags at all)
Add tags that are completely unrelated to the image
Add opinions/ commentary in the tags
Title DOS
Have the actual text in the image as the title (this is especially useful for image macros)
Have the name that of fanart given by the creator as the title (Protip: use copy/paste when at the source)
Have a title that basically explains what is in the image
Title DON’TS
Do not just mash characters that are completely useless, such as -_.,
Avoid titles that have nothing to do with the image (major exception being Filename threads)
Note DOS:
Source the image
Add relevant text that will help people to find the post in the future
Note DON’TS:
have a bunch or random text
leave a long rant (this is what the comment section is for)
Link to NC material
Source DOS
Link to the source page
Explicitly list the creator’s name in the notes
Say the name of the creator and work if the source is NC (primarily for Hentai Quotes)
Source DON’T
Leave no source when it’s extremely easy to find.
Avoid just linking the source with the name "Source"
Also, not part of the above but, I've noticed at least one user tagging like "Artist:artistname" which I think would be useful when the artist has a well know an unique name. It would also make it easy for users to see if the image is a repost. I'll be honest, I don't always tag the artist, but I try to list the creator's name in the metadata source.