Tolkien was generally favorable to any illustrations that followed the text; he actually explicitly mentioned that he was creating a “legendarium” which would h

Tolkien was generally favorable to any illustrations that followed the text; he actually explicitly mentioned that he was creating a “legendarium” which would have different interpretations. What he didn’t like was illustrations by those who never even read the descriptions, or created things based on other media (Tolkien dwarves vs Snow White dwarfs, for example).