Yeah, I've done crossover fanart for a couple of series I read. Both of the creators have already seen these pieces, but there's another I'm working on that I'm not ready to show yet.
Adi from my comic, Renegade Legends, and Kerren from A Silvertongue's Tale
and Koreal (also from my comic) showing a card trick to Roscoe and Elmo from The Sunday Hustle