Drawings of Unbelievable Scenes - Truly Marvelous Depictions~
You could make the argument that still life and illustrations based purely on reality are relatively easy. So on pixiv, when an artist comes up with something truly unique, it gets tagged with 発想の勝利 (risou no shouri, translated as “I thought of it first” on pixiv).
The illustrations featured below range from the fantastical to the borderline bizarre. The steampunk Totoro (from My Neighbor Totoro) is adorable though!