When you study Tolkien’s scribbles and sketches, a few things become clear. First, the narrative ofclearly consumed him. He wrote and drew, anytime, anywhere. Some drawings are dashed-off doodles inserted into margins of his manuscripts. Other are more meticulous.
The effort to map the geography of Middle-earth and capture its ambiance and hint of story, also can be seen in his trippy, colored pencil sketch "Moria West-Gate." Tolkien built a narrative into the drawing itself: The secret door, dwarfed by the cliff face, portrays the Fellowship's sense of awe upon seeing Moria, while the tiny waving tentacle of the Watcher in the Water portents the coming danger.
He was a talented artist