In addition to basic info regarding if you have it or not and searching to see who has what, I think Turbot should be able to provide a brief description of the difference between the real and fake versions (Or if there is no fake version) and include a link to a comparison picture if possible.
92 added the basic art information for finding out about forgeries, and #95 added the actual tracking and search functionality to allow for easy trading.
In addition to basic info regarding if you have it or not and searching to see who has what, I think Turbot should be able to provide a brief description of the difference between the real and fake versions (Or if there is no fake version) and include a link to a comparison picture if possible.
There isn't yet a page for art in New Horizons on the Fandom wiki, but I'm sure it'll be there soon enough. For now, this article has some information: https://animalcrossingworld.com/guides/new-horizons/jolly-redds-art-real-genuine-vs-fake-forgery-cheat-sheet/