Babies, by Gyo Fujikawa
First published in 1963, this tall board book for little kids has some of the cutest illustrations I've ever seen. My 9-year-old and 4-year-old daughter both love looking at the book, and I enjoy reading it to them.
Gyo Fujikawa's drawings of babies and toddlers is full of sly humor, and is dead-on accurate in depicting moods, actions, and behaviors of youngsters. It's an excellent reference for artists, too. I keep it in my studio. $5.99 at Amazon.com

You may have seen this, but:
http://www.whatisdeepfried.com/zogg/zogg1.html
not Ryo, but Eloise Wilkin, a related style, and then the perverse overlaying of Sci-fi....