Here’s Tornado 4 (高河ゆんラフ画集 tornado # 4), the artbook by Kouga Yun which was released in May 2007.
It includes various titles, such as Loveless, Naruto, Gundam 00 Gundam Seed (thx _profiterole_ and ch1b1_ch1b1 
), Boogiepop, Soukyuu no Fafner, sketches and one picture that I couldn’t identify (page 08) more Naruto (thx allira_dream).
Scans in high resolution 
Download »20.33 MB download mirror: mediafire »
Low resolution Download »5.52 MB download mirror: mediafire »
Please don’t upload this scans on animepaper.net because I desperately need more points there. 
I will upload them myself.