just a few notes…
-The tutorial in your link is not the best tutorial you can have.
its better to use hdr images for backgroung and global ilumination. You won’t be needing all those nodes in the world shader, and the illumination strength will be more realistic. (those nodes will not work good with other images, and they will just be part of the confusion).
Just set the Enviroment texture to ‘non-color’ when using hdr images, to let cycles use the true luminance value at each pixel.
-For matcaps, you don’t need too much. A good world and a simple shader is the way to go…
-which leads us to the next point: «Keep it simple». or better: «Keep It Stupidly Simple!» The reason is that cycles is already good in working with lights. Just tell how your material should work with lights and its done.