They are UFO artist (From Art Line - NYC)

Sylvia Rayner, Jeff Westover, Nomar Garcia, Anthony Taylor, David
E.Caywood, Landi Mellas, Roberto Malini, M. Dowdey, Peter Gutierrez, Rick
Smith, Dario Picciau, Bruce F. Horton, Jilaen Sherwood, Kris Hastings, Greg
Messina, David Barnhart, Andrew C. Stewart, Silvana Gatti, E. Wyatt Smith,
Harry KemSeng.