All drawing and painting from life is at some point done from memory, even if that memory is only seconds old. An artist’s ability to recall something previously seen is all the more important when their subject is no longer in view. Da Vinci, Corot, Degas, Whistler, and Inness wrote about it. In fact, Inness claimed that many of his best landscape paintings were done from memory.
The book, Memory Drawing: Perceptual Training and Recall (available from Amazon US here and UK here.), teaches you how to visually perceive and accurately recall those perceptions. It will also help you to improve your abilities to remember fleeting effects, seize essentials, and even enhance your imagination.
In addition to following the curriculum which is presented in the book, artists and art students alike are encouraged to go through the weekly exercises which are presented on the Studio Rousar blog.