Colored Pencils Shading Tutorial

This is a tutorial of how I make gradients blending colors, and since asked for some tutorial like this and later more people asked for a tutorial, I've made this, hope this gets useful to you and every suggestion is very welcome, since this is my first tutorial here

Edit:
Thanks for the Daily Deviation and for all the favs, There are a lot to thank each one, but I'll answer all the comments, maybe it will take some time, but I'll answer.