Friends, these wood duck feathers look like brush strokes,; the overlapping, fine details , and iridescent colors.  The blue color is not a pigment but rather a structural color, the light is reflected as the full spectrum, that results from the light being bent by  microstructure within the cells.  Perceiving the color is dependent on the angle from which one views.  If you stand ninety degrees from this angle, the iridescence is gone, til Tomorrow MJ