I would've preferred for Hasbro to entirely forgo the mask and just stick with Nucleon. Because Nucleon is actually sculpted to resemble Galvatron's head anyway, just not as pronounced and the detailing is obscured by the completely bland lack of colour. But if you look here and here, you can see that if Hasbro had instead just added purple to Nucleon then the head would already look like Galvatron without the mask.