Next, I walked my students through my process for refining a thumbnail, establishing basic lighting and value ranges in grey scale, and how to apply Color/Light/Materials. I went over the differences in approaching character concept art/illustration from a "line-based" approach or a "painterly" approach. I find that many concept artists lean towards either being a "drawer" or "painter" and this was my way of showing them that there's no reason you cant do both. Painting and Drawing are one in the same.
Here is a material breakdown that helps my students understand material properties and complex stuff like transparency, reflectivity,