This is one area that I think digital excels at. When I use my VTT online or in person, rooms get three descriptions. First the players see the map. Second they get the "boxed text" in the chat window they can read. Third they get my audio description.
This means I almost never have to describe size. It means that players get major information in 3 ways. So that people (like me) who often have a hard time building a mental image from a verbal description can get the details in a way that works for them.
You can do similar with battlemaps, terrains and miniatures, but digital is much easier/faster/quicker once you are there (but less tactile and no reading material for the players).
For instance, I tend to focus on priorities like
Obvious dangers to you now (creatures, moving effects, etc.)
Obvious dangers other than those ( pits, broken floors, crumbling roof.)
Exits and entrances
Major furnishings
Anything "active"
This is a good list. Though when going digital I usually ignore exits/entrances and major furnishing.
Are there "style guide" elements for room/scene descriptions defined for or used for official sources? ...
Would they help if there were?
Not that I know of. And since 5E talks about "natural language" I don't think their is likely to ever be one. If such exists, the DMsG Writer's Guild on FA\acebook would be the place to find it.
Would it help... yes and no. I mean how many people use Strunk & White's style guide or another except when writing for school?
The trick is not to do it as some sort of checklist. Speak actively, and always describe the sensations the characters are experiencing, not merely the attributes of the environment. Describe size in terms of characters reach and movement, for example. ...
Communicating specific information to one character is a good way to get them to pay more attention and communicate. ...
Be upfront if they're taking a risk, because they often don't see it that way. ...
This is all good advice.
But a picture/map is worth a thousand words. Both allow you to focus on meaningful description instead of the mundane size of room and number of exits.
Agree with this. It's why I feel maps and pictures are very valuable. But, not everyone agrees or has the resources to make such happen. But, I will emphasize that different people absorb information in different ways. And it is very likely that some of the players at any given table will absorb that information in a way different than the DM's preferred method.
So, remember, just because you like descriptions done in one manner, or you like maps or xyz, doesn't mean others will