Two editions of the same book, both paying homage to a different, previously existing, spacesuit.
The first is clearly: Space: 1999 - Mission of the Darians (1975) with some elements of the UFO and Moon Zero Two spacesuits
And the second is the classic: Alien (1979) Ripley's Suit
Because I'm reading a lot of old books from the 60's 70's and 80's this year I was quite happy to order myself an copy of the top one for that reason and the rather lovely cover. I'll update artist info when it arrives, if its documented.