I suggest you put the fact that it's on Archion to the front and let us not assume it from the link:
"German Church Books online", digital images, Archion (https://www.archion.de/) > Kurhessen-Waldeck: Landeskirchliches Archiv Kassel > Wolfhagen > Wolfhagen > Tauf 1830-1846 > Nummer 19 http://www.archion.de/p/53547f258d/ ....
Is "Nummer 19" called "Bild 19" = "Image 19" on the website/in the viewer? If so, I would use "Bild 19" as you already give navigation details.
Given the explicit mention of Archion and its URL you can hide the URL to the detail page:
"German Church Books online", digital images, Archion (https://www.archion.de/) > Kurhessen-Waldeck: Landeskirchliches Archiv Kassel > Wolfhagen > Wolfhagen > Tauf 1830-1846 > Bild 19 ....
You may want to add the access date to the main url of Archion "(http://www.archion.de/ : accessed on 26 July 2020)" because who knows what archion.de will look like in 20 years. Plus, it's standard for citing URLs.
The fact that the original source is from "Landeskirchliches Archiv Kassel" is already in the description so I think mentioning the original source (the name of the archive where you can find the physical church book) is not necessary in this case.
Note: I used this article as inspiration.