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I learnt something new today. The best size for a Youtube channel art is 2560px by 1440px, which is really big for something that most people only see about 1/3 of it. So most opt to just use a very big canvas with lots of empty spaces and have their channel names and live2D models pasted in the middle, or have a really big pretty art with their faces visible in the middle (Marine, AZKi), and then there's Aki with pic related. I haven't check out all the holos yet, but Aki is the only one to have the hidden part of the channel to feature something as far as I can tell.
