This is the 1967 cover of the book Galaxy Mission by Edmond Hamilton. I don't know who the artist is.
There are those moon domes again! We've seen them before in vintage space art and on some toy box and header art like this UFO rubbers backing card pictured. You even get some plastic ones with Imperial's Apollo Moon Exploring. Addenda: Anonymous has correctly pointed out the back end of Ed Valigursky's MEV2 on this UFO card. Looking at it again I notice that the smaller of the astronauts has an LP toy spaceman pose! And I now think the vehicle behind the MEV2 is based on the toy LP style Moon Bus. What do you think?
Galaxy Mission was number 4 in Hamilton's Captain Future series of books. Anyone know anything about Captain Future? Is he the same as Captain Power?
Anonymous has left the link to this picture by Robert McCall. Its spot on for the source of the top Galaxy Mission cover and elements of the UFO one! Well done! On Galaxy Mission one of the jet-packed astronauts has been spun round to face us and even the Missile's exhaust fumes have been lifted from McCall's original below!