We commissioned this piece (along with many others) from Lia Perrone, who's done a great job on many things for us. She does some great work, and you can follow her own Patreon at https://www.patreon.com/lpchan.
This Hydra was special, as she also did the inking live on her Twitch stream! You can view the archived video at https://www.twitch.tv/videos/179505490. While you're there, make sure to follow her, and let her know Green Fairy Studios sent you.