J.R.R. Tolkien: Artista e illustratore

His artwork seems so distinct and expressive—I'm curious what sources or ideas fueled his artistic choices and how they influenced his storytelling.

Seeing his sketches and paintings adds a new dimension to Middle-earth for me. Has anyone else felt that the illustrations deepen their understanding of the books?

His sketches feel so detailed and intentional, but I wonder if there was a lot of organic growth or if he had a clear plan from the start.