Gladiator Helmet Artwork source file is able to grab in various web, follow the link down below :

TeePublic :

https://www.teepublic.com/t-shirt/51047903-gladiator-helmet-artwork?store_id=1816767

RedBubble :

https://www.redbubble.com/i/sticker/Gladiator-Helmet-Artwork-by-WOLForDEER/152837991.EJUG5

Creative Market :

https://creativemarket.com/Wolfordeer/42273305-Gladiator-Helmet-Artwork

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best regards

Tony Midi