A "life drawing" is a drawing of the human figure draw in real time from a live model. Life drawings are based on the observations of the human figure, anatomy, composition or color studies. Figure studies maybe done in preparation for a more finished or larger work.
Life Studies in Alla Prima
Alla Prima, Italian for first attempt, is a painting technique. It entails a wet-on-wet approach meaning that layers of wet paint are applied to previously administered layers of wet paint usually in one siting. This allows the painter to work quickly to capture the essence of a live model.