I've been to many life classes over the years and it's a good way to practice drawing the figure. Here are two more selections in different mediums. The top drawing was done in four twenty minute poses, and from memory, the other one was done in two twenty minute poses. One of the problems with many life classes is that a twenty minute pose is considered enough, but much longer poses are essential to construct a figure with more structure. One often hears it said that a quick pose captures the essence of the model, but essence is really the life force, and drawings that are done from long or short poses have the same amount of essence within, if they're alive.
White conte and pastel on black paper, 75 x 54.75 cm
Oil wash on oil sketch paper, 53 x 42 cm