One of my favourite painters is the English pastelist Mark Leach. He was born in 1952 and unfortunately passed away prematurely in 2008.
I love his sense of colour and his very individual work. He was/still is a great inspiration for many pastel painters. His book "Raw Colour with Pastels" is a comprehensive and very inspiring book about his way of painting and pastels altogether.
Venetto Landscape 27"x27" pastel on paper
We should always remember that we are artists, not scientists. Our job is to explore the beauty of two-dimensional form and colour in a way that stimulates the intellect and emotions, not necessarily be bound to any truth to nature.
Thanks so much for your suggestion, Karin Goeppert!