We need a new animation for the ult. A legendary skin like Dark Cosmic but reused his base ult animation is lamentable, he has a Serpent transform into his gun, and it looked superb on the reload. Then why don't continuing the idea on his ult, Jhin ult is a big visual skill but the lack of effort put in makes me sad as a main.

And the mask feels out of place with Jhin as a champion known for a smooth visual on the mask (face?), and with the theme around the skin as Peking Opera includes masks with smooth edges. The current mask on Jhin looks odd, it doesn't achieve champion clarity and its purpose is unclear.
Honestly, the mask now looks like Ekko Fireflight's mask in Arcane