One of the most problems for traditional artists, specially traditional mangakas is when it comes to coloring! Most of the times a publisher/editor frequently asks for submissions with colored art work related to the future published mangas and sometimes even some colored pages.
Some of these traditional artists usually use Copic markers, water colors or just coloring pencils. For this specific subject, here’s some stuff I found on the web that might get worth a look:
Some more stuff to see (Copic Markers and coloring pencils):
I hope you all find this useful and by the way, I updated the Link Center page (added some more links for you to see) 😀