Well, everything, to be honest.
Grassblades is equal parts my love of folklore and mythological creatures, my fascination with historical architecture and clothing, and my weakness for the Lone Wolf and Cub-y wandering parent and child-trope.
My oneshot Wishlight leans heavily on my adoration for fairytales, while the Stranger Things-oneshot is my excuse to draw a bunch of tea and tea-related things, as well as again getting back to the folklore and fairytale obsession. And liminal spaces.
It's also things like varying bodytypes, worldbuilding through visual information, creating a sense of a populated world beyond the immediate scope of the story, etc., etc.