There is a huge list of possible metadata associated with files.
Most usually, only a small fraction is actually used in a file.
The metadate labels are usually too short, and too ambiguous,
to serve to explain what fields exactly are meant or used for.
MediaWiki users to a broad extent cannot be assumed to understand
them, leave alone being familiar enough with them to know by heart
what's behind them. Thus, listing the metadata is of little use
to non-expert users, and may misguide them.

For very many metadata fields, there exist good descriptive or
even quasi normative web pages. Many of those are mentioned in
the message documentation associated with field labels, such as
MediaWiki:Exif-scenecode/qqq

I believe, it would be both helpful and educating to have such
links associated with metadata field labels, either by making
them links themselves, or, imho better, by placing a small link
next to them, similar to a footnote link, but opening a new tab
or window directly.

So, this is what I suggest.

Version: unspecified
Severity: enhancement
URL: https://commons.wikimedia.org/wiki/Commons:Village_pump/Archive/2011/05#exif_descriptions