There is a process on our support site that can help you get the game listed on Twitch with box art: https://help.twitch.tv/customer/en/portal/articles/2348988-adding-a-game-and-box-art-to-the-directory
There is a process on our support site that can help you get the game listed on Twitch with box art: https://help.twitch.tv/customer/en/portal/articles/2348988-adding-a-game-and-box-art-to-the-directory