Beautiful series. I think that your butterfly is a dark form female Easter Tiger Swallowtail ( Papilio glaucus). The markings aren't correct for a Spicebush Swallowtail and if you look you can just see the dark stripes on the wings, especially in the third photo.
Here is an image of a Spicebush: http://bugguide.net/node/view/859428/bgimage
Compare to images here of the dark form female Eastern Tiger Swallowtails:
http://bugguide.net/node/view/746407/bgimage
http://bugguide.net/node/view/593658/bgimage
http://bugguide.net/node/view/432418/bgimage
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