July Fourth in Duckburg (1976)

[Myklebust,Are]

In Carl Barks' painting "July Fourth in Duckburg" (1976) (Code: CB 0IL
119) he has included caricatures of some real-life people of the comic
fandom in USA. This is in fact Barks' only Disney painting with real
persons instead of those animal-faced characters.

There are seven persons (including a child) to the left and six persons to
the right in the painting, a total of thirteen persons.

My guess is that the tall guy in the cowboy hat to the left is Bruce
Hamilton. I am sure we also will find Robert Overstreet, Mike Barrier and
Malcolm Willits here too, without having any clue whom they are in the
painting.

Here are a couple of links to the painting:

http://digilander.libero.it/carlbarks1/july%20fourth%20in%20duckburg.htm
http://www.carl-barks.net/arlarge/ar26.html

Can anyone please help to identify these persons!?

Best,
Are Myklebust
(Norway)