This was done for the Guild Wars 2 Art Show, which airs every Thursday at 08:00 UTC (12:00pm PST) on their Twitch channel: www.twitch.tv/guildwars2.
The Guild Wars 2 Art Show is where various artists share their process of creating fan art for the game.
You can watch a replay of the show on their Twitch channel at www.twitch.tv/guildwars2/v/107…
For past artwork done for the show by other artist, visit the Guild Wars 2 Art Show Flickr Album.
You can also watch without the chat below: