The artist in question is Zack Finfrock, the creator behind Fallout: Nuka Break, a fan film about a former Vault dweller who's searching the eastern California wasteland for an "ice-cold Nuka Cola".
The creator used the T-51 Nuka-Cola Power Armor as inspiration for the design. The Fallout community was particularly impressed with the weapon's weathering, decayed by dirt, grime, and gunpowder.