source:
https://archive.org/details/how-to-draw-illustrations-the-daisuke-ishiwatari-way/page/n29/mode/2up

Original text, artwork, and tutorial: Daisuke Ishiwatari (Arc System Works)

English translation, editing, and scans:
solradguy (solradguy.tumblr.com)

Translator Note:

PDF of the English translation included in the back of Artworks of Guilty Gear X 2000-2007 by Daisuke Ishiwatari. Also includes scans of the original Japanese pages, pages with the English translation edited in, and high resolution scans of the completed artwork plus the pencils for the artwork which were originally printed on the back cover of the book.

Archive.org upload for the full scanlation of Artworks of Guilty Gear X 2000-2007 can be viewed over here: https://archive.org/details/artworks-of-guilty-gear-x-2000-2007-english