I found the mold on Amazon. I had to get it, I painted a scene like this for my bf, so he tattooed my painting on his arm, so when I saw the mold, I had to get it lol

Guitar Resin Mold,Silicone Molds... https://www.amazon.com/dp/B09T2P528Q?ref=ppx_pop_mob_ap_share

The pictures make it look way bigger than the mold is. Make sure you read the specs.