Hey, I was doing that model while watching the mario & luigi stream, but I just managed to finish it today!
It is based on this old image from the booru, which i did found on one of your streams:
https://orig00.deviantart.net/f1a1/f/2018/158/0/f/handsome_mario_by_elesis_knight-dcdpeb9.png
But, since the image was deleted, maybe by the artist itself, I could not find the source for it, so I hope I can find his name here, in order to credit him appropriately too.
Vinebooru
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It is based on this old image from the booru, which i did found on one of your streams:
https://orig00.deviantart.net/f1a1/f/2018/158/0/f/handsome_mario_by_elesis_knight-dcdpeb9.png
But, since the image was deleted, maybe by the artist itself, I could not find the source for it, so I hope I can find his name here, in order to credit him appropriately too.