Unable to answer "What kind of artwork is this?" – History Trees (Broadleaved Tree (deciduous) - Common Ash) – https://osm.org/node/7812928890 via StreetComplete_ee 63.1:

Looks like the tree is here and it has some broken bits on it, but the artwork doesn't really seem to still exist as it was 

Attached photo(s):
https://streetcomplete.app/p/342715.jpg