Burned Skull Illustration source file is able to grab in various web, follow the link down below :

TeePublic :

https://www.teepublic.com/t-shirt/51012349-burned-skull-illustration

RedBubble :

https://www.redbubble.com/i/sticker/Wolf-Kingdom-Illustration-Logo-by-WOLForDEER/152784986.EJUG5

Creative Market :

https://creativemarket.com/Wolfordeer/42267823-Burned-Skull-Illustration

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best regards

Tony Midi