This site says “Ed Emshwiller (Emsh) cover and art”: https://www.mycomicshop.com/search?TID=22780679 Reply
But the ISFDB says Freas, and it looks like him to me http://www.isfdb.org/cgi-bin/pl.cgi?60007 Reply
This site says “Ed Emshwiller (Emsh) cover and art”:
https://www.mycomicshop.com/search?TID=22780679
But the ISFDB says Freas, and it looks like him to me http://www.isfdb.org/cgi-bin/pl.cgi?60007