Character design basic lighting

Value is important when considering to color your pieces. When looking at realistic color you want to have realistic dark's and lights

https://www.youtube.com/watch?v=eiTj_qVF2j0

This is a screenshot showing how the colors work 

Once you understand color you need to know where your light is coming from here are example of how light reacts to different materials

normal

metal

glass

Once the basic are down you can apply them to your drawings here is a rough example how color and light alters  picture