I went to a lot of photography workshops back in 2008. They were all-day workshops with critiques and group discussions in the mornings followed by photo shootings of models in the afternoon. They were enjoyable.
Recently I took out the photos I took back then for quick sketches as my daily drawing practice.
I believe it requires at least 10 practice drawings for any study. Here are some quick sketches from my art journal on female portrait study.
Smiles