In an interview with Vulture, Pixomondo’s VFX supervisor Sven Martin talks about how they went about creating the dragons for season 3.
“The main idea for them this season was capturing the difference between how they look when they’re demure and when they’re threatening.” As babies, the dragons were able to dispose of the warlocks by setting them ablaze, but Martin said that was nothing compared to the terror they can now inspire. “We haven’t seen them really angry yet.”
The personalities of each of the three dragons will emerge more fully later in the season, but for now, Martin said to consider the black dragon, Drogon, the leader. “The other two are his wingmen.” Here’s a preview: A few episodes from now, Drogon will get a bit aggravated, and for that, Martin added features inspired by the well-documented reactions of “angry swans” and a famous movie beast. “One of the things that we played with that’s also new is frill and what it would look like when they’re mad. There are real lizards that have it. Or you may have seen it before in the first Jurassic Park, where the dinosaur is screaming at the guy in the car.”
There’s more at the source including what real-world animals they used as a reference for the dragons in flight.
Winter Is Coming: Love reading about this kind of stuff. Just another layer of incredible detail put into this show.