I did a small number of pieces involving huge space "birds" -- partly in association with the 1978 Worldcon. (Iguanacon, Phoenix AZ -- get it?) This one used an experimental technique. While I did most of the landscape's dark grey tones with a ball point, I cut a mask of the horizon and the fighting phoenixes, and spray painted the sky. Afterward I painted in the stars. This image is scanned from the cover of a fanzine called Scientifriction. (Yeah... friction.) I used Photoshop to restore the light near the horizon, but left the golden colour of the cover stock as grey, giving the phoenixes their darker tone. Then I filled the "moon" white. The result is more similar to the original than the cover alone.

The illustration is apocryphal, but the landscape is The Eaten Lands. See the second upload after this one for more exlanation.