Light Logic (also known as shading)

I am finally learning how to shade!!! Who knew that shading was broken down into sections. There is the highlight which is the brightest of the brights on the object. Then there is a Cast Shadow which is the darkest of the darks. There is reflected light faint rim of light reflected back onto an object from the surfaces surrounding the object. The crest shadow is the shadow on the object.

Don't forget about the background!!!!!!!!!