You mean the Space Jockey one and the Egg one? I have the Space Jockey one, and think it is quite amazing. I love the graphic presentation of the piece, and the SJ is one of my favorite things about the original film. I do seem to always pass on the Egg though, so I must not like it as much.
Do you mean the Derelict interior depicting the Space Jockey? I love it.
Speaking of these posters, I have a nagging question since I don't know that much about Mondo and their history. I am a patron of Gallery 1988, mostly due to collecting Luke Chueh. That is how I came to find out about the Ken Taylor Alien prints, and they were kind enough to allow me to buy one through email since I am in Vegas and they in L.A. Anyway, were these Alien posters offered through Mondo? Were they a separate edition? Mine says #73/85 in pencil on the lower right, but is that all there really are? Man, I love this print.