Drawing on black paper

This is one of the homework of drawing fundamental.My very first time sketching on a black paper. At first I found it was very hard to do by using a pastel to draw but when my classmate and I were doing the homework that we found that actually we can use white color pencil instead of only use pastel.A black background actually bring a more interesting light effect for the painting. The puppy painting is the very first drawing and I love it the most.