For Faces and other Nudities, you must have a Chamber open and exposed to the Air, whose Walls are wash'd with a*Carnation Colour. The time you are to chuse for Painting, is the Summer, when the Sun is covered with thin Clouds; but if you fear lest it should break out, you may take care to have the South-Wall of your Chamber rais'd so high, as to be a Screen to the Northern one, and to prevent the Sun Beams from striking upon it; otherwise the reflected Rays will make false Lights, and spoil your Shadows.

* A Flesh-Colour.