From pinterest.com/napalkova/18-век/?lp=true; enlarged by half. Also posted to the Reign of Louis XVI - 1775 to 1789 Album here.
The dress combines a zone bodice with Amazon (military) style.
Keywords: van Loo, high straight large curl coiffure, veil, earrings, necklace, zone bodice, lace bertha, scoop neckline, lace-edged over-bodice, frogging, long tight sleeves, bracelets, lace contrasting cuffs, lace-edged under-bodice, close skirt, handkerchief, mask