Sequins! This bird is the same individual as the previous shot and the previous shot.
Note the clearly seen moulting, and the "sequins", irridescent gorget feathers in isolation against the breast feathers. You can clearly see the sheaths still on many of the emerging new feathers.
photography,digital darkroom,hummingbird,high speed flash, high, speed, flash, macro, Greg Scott, Gregory J. Scott, tutorial, techniques, unedited images, sequence, session, one hour, Ash Canyon B&B, Arizona, Sierra Vista, Southeast Arizona, technical