On the left: Eddie Jones artwork for Stewart Cowley's 1980 book The Space Warriors
. On the right: Peter Andrew Jones artwork, found in his 1990 art collection Solar Wind
, but created earlier.
The similarity in the spacesuit design and pose was pointed out to me by Instagram follower very_little_gravitas_indeed, who wondered which came first. I looked into it.
Here's what one site has to say about The Space Warriors and its "mostly inferior" art: "Indeed, many pieces are derived, almost directly, from better known sci-fi pieces of the era. A roster of lesser know artists contribute, with most of the artwork provided by British 'fan-artist' Eddie Jones."
Looks like this may be evidence of that direct derivation! I'm closing the case.
Additional reading: Some selections of Eddie Jones' work, and selections from Peter Andrew Jones' Solar Wind.