Drawing after plaster casts is great fun.
It helps a lot to focus on tonal shifts and anatomy.
Nevertheless I find it always astounding to find so much color and reflected light within the shadows and the "white" of the casts.
cast collection of statues from the ancient world in Berlin was lit from a cool window behind and several warm lights in the front.
The collection is a wonderful place to practice drawing, it's open from thursday to sunday (2 to 5 PM).
The entry is free.
Drawing classes that come with 15 or more students can come outside of the regular opening hours for a fee of 2 €'s per student.