I tried to fix the lankiness by broadening his shoulder and shortening his arms.
I also made his legs a little shorter.
Looks like you and I are both struggling to think of a design for the upper arms.
I feel like you should remove the Trans-Neon Crystal Armour on his upper arms entirely. You could then be able to make (custom?) bulkier arms.
Lookin good.
The legs especially.
i agree with @AdamusTheFirst
To be honest, I can’t really see any changes. All my problems with the original still persist.
He needs to extra wide armor shells on his legs, if those even come in black, and if not, flip the current ones forward.
The upper arms, I agree with Adamus, should just be something custom. Use the crystal pieces to add spikes coming of from his neck like it is in JtO.
Yeah, a technic construction would help with the arms.
