Upgrade image from Wikimedia posted 1 April 2015 from Wikimedia; spots removed and the right edge fixed with Photoshop.
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Marie de Medici's dress has a white lace ruff towards the back of her neckline and a deep rose or red collar about the lower neckline. The collar may extend around the upper neckline below the white ruff. Her dress also appears to be slashed to show deep rose material beneath. Her neckline has a rounded triangular shape in keeping with the times. She also appears to be wearing an Elizabethan-style wheel, rather than French, farthingale.
Keywords: 1622, Pourbus the Younger, Marie de Medici, Medici family, Bourbon family, Queen, curly coiffure, hair jewelry, vee neckline, collar, lace, neckline ruff, long puffed sleeves, back flared engageantes, cuffs, wheel farthingale, necklace, draped necklace, earrings, brooch, bracelets