cosmicgambler's request, a colorful Guanlong, giving an unseen female a mating display, showing off his long display feathers (the ones on his neck, chest, arms and tail).
In my head I imagined as only being there during mating season, then molting off afterwards. Also, the head probably dulls a bit when not in mating season, as do the flanks. I think the skin color changing is possible (although I’m not too sure), but out of the two, the molting display feathers seems more likely? I dunno.
Anyways, keep on giving requests!