What site is a good one that teaches proper prismacolor type marker usage for graphic designers?

Question

I want to make my drawings look more like professional graphic artist's renderings. Please point me in the right techniques. I am attending an online class and the book we have does not teach how but rather shows us good examples of drawings made with graphic design markers.

Answer 1

I use this tutorial with my middle schoolers but it probably isnt professional but it is a how to.
http://neondragonart.com/dp/tutorials/marker.htm
http://elfwood.lysator.liu.se/farp/markers2/