The current media standards are:
6 media pieces embedded; screenshots, renders, concept art, static or animated GIFs, Sketchfab previews, audio excerpts (NB you can also upload mp3 files to your Videos section) or one, at least one minute long, video, embedded in the article and not merely linked via a preview image, the video has to be playable. Only your own media, someone else's let's plays and art should be added only as bonus or extra. Sometimes dev posts that include "inspiration" art from other games may be featured, but well, in the end, every article is individually reviewed. Sometimes code snippets are also treated like they were media pieces, depends on the final quality of the news to be or not to be featured.
ModDB, SlideDB, VRDB
(VRDB only articles, does not include news pieces double featured on both VRDB and IndieDB or ModDB)
4 images or 4 media pieces of other kind embedded, or one long enough video embedded (not just linked). Someone else's good let's play videos are allowed in featurable mod news, as long as the modder does not try to take a front page spot every day of the week or something.
Double-featured news is high quality indie news (media-rich, text content rich) that was frontpaged on two or three or four sister sites, for instance indie news that was homepaged on both ModDB and IndieDB even if it was not modding related. To have your news piece double-featured, your article has to be of substantially higher quality than one of the above standards, for example include both videos and images, or be a long article with tons of images included. Newcomer's news that needs exposure and higher quality news of regulars can also be bumped to the top of the front page: the time and date when you submitted your article does not matter, it is the news quality that does.
The above guidelines apply to all community news. News pieces posted by staff members (DBolical staff), technical issues news, site update announcements, special features and sponsored posts are all exempt. Exceptions are made for community news that is just below the standard (5 images indie news, 3 images mod or app news), but posts of that sort are almost always single-featured on one sister site, and almost never double-featured.
If you see any community news that does not follow those guidelines, it is most likely because the author, ignoring news quality standards, removed the staff-embedded or self-embedded yet obligatory media, or the media has been broken by a third party and does not show up, and you can report those cases via a quick PM with a link included in your message: Moddb.com