The artist is Tadanori Yokoo, and these are works done for a book called 幻花 by Japanese author Harumi Setouchi. (Can't paste links or anything into your comment form, for some reason.)
BTW, I have no connection with the blog author. I'm just a guy who happens to know some Japanese.
thank you so much!i shall investigate further...and learn some Japanese ;)
I am familiar with some of his poster graphics i didnt know he made these amazing drawings, i love him even more now!!!