I remember both this and Suiseiseki one from 2008-ish when I saw them. Nice to see these are still around. At that time, these really opened me eyes about pros of digital drawing. But most importantly, they helped me to discover PT Sai.
The artist is Iori Yakatabako, who goes by the username iorinn on Deviantart and Twitter. Unfortunately, I haven't seen much work by the artist in recent years. I share the same sentiment's as a previous commentator had - I wonder how the artist is doing now. I hope he or she is doing well.