By accurately placing highlights and shadows an artist can create the illusion of form. Chiaroscuro - An Italian word that means the arrangement of light and shadow. Today chiaroscuro is also called modeling or shading.
Applying SPF 70 is the best that can be applied to the skin to avoid skin cancers, sun burns, and wrinkles
Abstract art was created at the cusp of the 20th century. It is an art style that breaks away from drawing art as it is represented in real life. Abstract art is about exploring form and color. One could even venture to say that it is artists drawing how they feel. Abstract art isn't about making perfect copies of real life. Sometimes, it isn't even about giving the impression of real life without all the little details. In fact, depending on the artists, abstract art became about the process itself. Representational would mean that you draw what you see. Abstract art is far from that concept.