My favorite LP cover art was the Levine M3 (with Marilyn Horne).
The cover art shows animals of the forest, out in the night, looking into Mahler's composing hut, where there is a silhouettle of Mahler at work composing. An angel is handing Mahler, through the window, a bouquet of flowers.
For me, it has captured the "delight-in-nature"l spirit of Mahler, showing his affinity for nature, animals of the forest, and night.
It was wonderfully done by the famous children's book illustrator, Maurice Sendak.
--John H