So... is Yume no Crayon Oukoku finished or not?
NO, it is not finished.
Why?
The anime finished after the manga:
Anime finished: January 31, 1999
Manga finished: January 01, 1998
... But MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Synopsis
Princess Silver of the Crayon Kingdom is beloved by her people, but harbors a secret: twelve troublesome habits.
These habits, kept hidden by her worried advisors, threaten to bring embarrassment to the kingdom.
During her twelfth birthday celebration, a careless oversight stemming from her quest for romance leads to disaster.
The King and Queen are turned to stone, and Silver embarks on a journey to reverse the curse and save her parents.
Accompanied by loyal companions, she must confront the consequences of her actions and find a way to restore her kingdom.