Daniel told BuzzFeed in an email that the illustrations are digital paintings and said, "I wanted to improve on the ones I did in 2012."
He added, "My favourite has to be Scarlet Witch. She's just too powerful."
Daniel explains that he's seen Joss Whedon's Avengers: Age of Ultron, and said, "Yeah, it's pretty solid. Not the best story but it's pretty damn fun to watch."
"The hardest to draw was Hawkeye. Mainly because it was difficult to design him to look better than he actually is in the movie whilst still retaining his general look."