Another illustrator from the 70's was Ingahild Grathmer[1] which was said to be a favourite by Tolkien himself[2]. Maybe he was polite because of the noteriaty (not sure if known at the time) but I do like them as well. Have a look at the documentary on YouTube: https://youtu.be/rNqVqzIxi3A&t=24m19s

(Go to 24:19 for Ingahild herself)

[1] a.k.a. Margrethe Alexandrine Þórhildur Ingrid (https://tolkiengateway.net/wiki/Margrethe_II_of_Denmark) [2] https://www.mentalfloss.com/article/66764/time-queen-denmark...