Board Thread:General Discussion/@comment-25034020-20191022161652/@comment-40159980-20191126224125

Diana lover wrote: These look credible imho...Got them from Twitter. Did a quick google image search and, no those aren't real :/

These are from book for Drawing&Design Techniques (bye Yoshihiko Umakushi I assume)

https://page.auctions.yahoo.co.jp/jp/auction/t650192287