I had a coupla (like that my new word?) folks ask me what are copic markers? Well, I am here to tell ya that they are the best thing since sliced bread. Copic Markers shade themselves sort of.
You color with the marker then go back over it again and instant shading. If you have three colors in the same family you can create just beautiful images. I love love love my copic markers and for the price we get them at I find them to be the best ever.
So, that is what a copic marker can do... much better than marvy or any other in my humbel opinion.