All of you who have taken my classes started with the sphere…understanding the light and values of shape. The link below describes shape and light beautifully 🙂
David Gray, an amazing artist…..enjoy. Click on the blue link below….
https://dgpaints.org/2014/09/25/contol-your-values-a-lesson-from-the-sphere/
Barking Dog Studio 
Thank you for this clear, easy-to-understand article on values and form…always such helpful reminders!
>