Why did they reject this?

[kawin240]

Hey, often grafit in Eastern Europe has been created by vandalism which is not allowed. From what you shared it is not clear yet if this was the actual problem, but it is the most common issue in the region:

Unique Art

Works of art and architecture encourage exploration and reflect the communities where they are found and their values. Art Works of art are generally eligible so long as they are unique, distinct, and permanent. This can include indoor artwork (framed and murals) and museum exhibits that are intended to be permanent. Nominators should use the official title and credit the artist when possible. They should tell the story of the work, explaining the cultural context. Submitters should make use …