X-Men #129, page 10 by John Byrne & Terry Austin & Bob Sharen. 1980 :

Diablo Vs Fantastic Four commission by John Byrne. 2007.

X-Men #136, page 19 by John Byrne & Terry Austin & Bob Sharen. 1980.

X-Men Vs Sentinel commission by John Byrne. 2010.

 

Marvel Team-Up #53, pages 6 & 7 by John Byrne & Frank Giacoia & Don Warfield. 1977.

Galactus and his heralds – Silver Surfer, Firelord, Terrax, Nova & Air-Walker commission by John Byrne. 2008.

Source (Great & Awesome Tumblr Blog about John Byrne) :

http://johnbyrnedraws.tumblr.com/