The Discotek Media release features artwork by Mariel Cartwright & Brady Hartel
See Hartel's original announcement here:
https://twitter.com/ashuraou/status/779486599419666437?lang=enThis is the original promo pic:

Nothing to do with the original Japanese release. But at least much closer to the original than the recent Atsuko Ishida artwork for the Japanese Bluray (even if Ishida herself was the original designer)
But this other image used in the cover is certainly an original Atsuko Ishida artwork used in an ad found in Newtype September 1997 announcing the LD box.

Finally, and if I remember correctly (I may be wrong here) besides being director in some episodes, Masami Obari also made some secondary artwork for promo posters and CD illustrations back in the time. He was key animator and responsible for some visual effects and special illustrations. You can find Obari's artwork in the Anime Albums' fold-out posters like this famous one:

...
I'm not sure if the VHS covers are her or not. a lot of similar hallmarks but am not sure, so!
Well, most of her artwork was recycled to make the trading cards, VHS and LD covers (Japanese releases), promo posters and and in magazines.
The original USA VHS release also used her illustrations. You can see some of them in her artworks.
