1. My experience with oil pastels was good. It was difficult to shade correctly at first, but it got easier quickly.
2. You create value using oil pastels by shading the with light colors close to the light source and with dark colors on the parts further away from the light source. You always shade with the shape in order to make it look 3 dimensional.
3. Overlapping is important because makes a smooth transition between colors. It prevents lines dividing the colors, creating more value and making it look more realistic.
4. Yes I showed a clear light source. The highlights on the left side of the shapes and the shadows going to the right show that the light source is to the left of the shapes.
5. Value is important because it adds depth to the drawing. It makes the shapes look 3 dimensional even though they are on a flat surface. Value makes the shapes more realistic.