one of the very first text adventures I played as a kid [https://en.wikipedia.org/wiki/Twin_Kingdom_Valley] had static illustrations; I've always thought of it as a nice touch to add to a text adventure. they key difference between that and more modern graphic (or hybrid text/graphic) adventures was that the illustrations were not meant to be informative; you couldn't look at them and find objects to interact with, e.g., they were just there to add to the mood.

I remember seeing "Choose Your Own Adventures" early in the 80s and thinking "Hmm.. Zork sure would be cool if it had a few pictures like the CYOA books." And of course, about a month later I saw the first text adventure with illustrations. I don't think I ever played Twin Kingdom Valley, but after reading the wikipedia page, I sort of want to now. Oh... aha!

https://archive.org/details/d64_Twin_Kingdom_Valley_1987_Bug...