I love Windsor McKay. The Little Nemo strips are excellent.
The entire series is on archive: https://archive.org/details/LittleNemo1905-1914ByWinsorMccay
Also his pioneering work in animation, Gertie the Dinosaur, is worth a watch: https://youtu.be/32pzHWUTcPc
And a shameless plug for a guide to Tibetan dream yoga I made using McKay's illustrations: https://imgur.io/a/lc9x6Yf