That art style is a crime on the eyes.
IDK I think the artstyle looks fine; it's just that it's a bit too dark and everyone has the same constipated expression on their faces, except Zeus.
Basically if he made it a bit more colourful with a more One Piece-y vibe, it could look good.
That or if he drew Shanks, Kaido, Akainu, Kuzan etc.....you know, characters who could pull off more sombre looks.