Heroes of Might and Magic II: "The Necromancer's Invasion"

I'm not sure I fully understand the meaning of your statement. Are you suggesting that all artists should create the same painting? Is that even possible? Each artist has their own style and method, and they can be so different that combining them into a single work is not easy.
Besides, many of the artworks have already been used in promotional materials, which you might have received at exhibitions, for example, by defeating your opponent in the game "The Lord of the Rings." Almost all of them actually exist in the game.
Is that what you meant, or did I misunderstand your question?