Originally commissioned by the Opera del Duomo for the Cathedral of Florence, it was meant to be one of a series of large statues to be positioned in the niches of the cathedral's tribunes, way up at about 80mt from the ground. David was originally commissioned as one of a series of statues of prophets to be positioned along the roofline of the east end of Florence Cathedral, but was instead placed in a public square, outside the Palazzo Vecchio, the seat of civic government in Florence, in the Piazza della Signoria, where it was unveiled on. Hope this helps!
The Rococo style began in France in the first part of the 18th century in the reign of Louis XV as a reaction against the more formal and geometric Style Louis XIV. It was known as the style rocaille, or rocaille style.
When referring to a piece of art, especially 3d art like sculptures, "proportions" is used to describe things like height, width, depth and general measurements
