Poking around the Internet Archive yesterday, I discovered the series bible to BraveStarr, the 1987 Space Western from Filmation. The most interesting part to me was the illustration. They aren't credited, but some of them have a bit of Moebius vibe.
Others strike a gritty tone that the series and remind me of illustration in pulp magazines.
Nice and evocative, and a different tone than the eventual series.