the sons of Celestia is part of a commission project to "go crazy" with MLP in 40k.  i stumbled across a watercolor brush in clipstudio and fell in love with it.  eventually i make some Luna marines (and think of a name for them) and some models for the princesses 
all done in this style because i really like it. also my comic "Peak wulf" is being done in this style and i am very excited at its progress