A classic dragon shape, eg Smaug, approximately 6 km length from nose to tail with similar wingspan.
Ignore square cube rule due to magic and also neglect gravity as its native habitat is space.
Eyes made of crystal / gem (sapphire or emerald).
How big roughly would you expect the eyes to be?
Assume dragon is dead and body has decomposed / broken after falling from space landing like a comet, creating oblong basin type crater, buried by dust after fall and fossilized only the eyes remain, how big should they be?