Personification is giving human traits to nonhuman things or organism.
In this case, the feathers are personified as being able to "dance", when obviously it isn't exactly "dancing".
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The characteristic of Renaissance style that was not abandoned is the naturalistic realism of the faces depicted in this work of art. Parmigianino's painting featured a sophisticated combination of colors and the rightful proportions of the body and face except for the long neck which made the artwork significant in its own way.
Black is certainly a colour.