Quick thumbnail sketch #1
It is only 3″x4″ in size and colored with markers and colored pencil using all six colors (red, orange, yellow, green, blue and purple). Outlined with Prismacolor black pencil. Took only 5 minutes, it is a great way to communicate your great ideas quickly with your clients.
Quick thumbnail sketch #2
Again, the size and time spent is same as the one above, tips used are: Color Rainbow (all six colors), Color Pairs (orange and blue), Outlined with Black (Prismacolor black pencil), Dark foreground / light background, Color Glow (using light colors on white paper), Try them, you can do it too.