The technique I use in my works is changing and evolving as I do. There is a lot my very own inventions in it but the very base comes from Renaissance Masters. Masaccio, Leonardo da Vinci , Raphael are commonly considered to have pioneered the use of chiaroscuro to create the illusion of relief - notably in the modelling of the human body.
Chiaroscuro modeling is supporting the effect of colour. In order to use the under painting efficiently, I put the colour transparently. The transparent layer of paint spread over the top of an opaque passage that has been given some time to dry. Light travels through the glaze and is reflected back off of the opaque layer below. The light in the painting constucted this way lit the colour from the bottom.