"Draw a kitten" would not be worthy of protection.
A two paragraph detailed scene description would be.
OK, but does the description being copyrightable mean the work also is?
Suppose some guy commissions an artist to make a painting based on a two paragraph detailed scene description. Further suppose the artwork gets entitled by that two paragraph detailed scene description, so others know what it was. (Weird, but that's par for the art world.)
Now suppose some other guy commissions another artist, who has never seen the first painting, to make a painting based on that same two paragraph detailed scene description. It gets a regular, short title. Is that new painting a copyright violation?