Warning, huge file, you may need too download it to see better.
There are tons of ways to shade, this is just how I, personally, do it.
My shading technique changes constantly (because I hate how long it takes and how messy it is with characters that have tons of different colours and markings) but yeah, a walkthrough on how I shade, as requested by a friend //v
Sorry if there are any typos, I type fast so I often don't notice. ;v;