I'm a fan of Tolkien's art and have a couple of prints on my wall, The Hill and The Tree of Amalion. They have been up for years now and I haven't gotten a bit tired of them. They convey Tolkien's voice to me almost as effectively as his books. He didn't need an illustrator.

https://www.smithsonianmag.com/smart-news/jrr-tolkiens-estat...

https://tolkiengateway.net/w/images/2/20/J.R.R._Tolkien_-_Th...