Here's my modded Samus Aran of Metroid Figma. It's the same as the Figma release except for black panel lining and a slightly different shading. The original figure was sadly lacking in paint apps and this really brings out the detail. She needed one other thing, a human Samus head! Her head was made from a ML Black Widow with sculpted sideburns and ponytail. I also gave her an Ice Beam blast made from various accessory parts.
I had thought about getting a "naked" head for my Samus too, and I was thinking about using the DC Direct Armory Nightwing's alt head. Which is just a more serious DC Direct Crisis Powergirl head.
That head has a whole "Other M Samus" look I really dig. Though you'd have to mod her hair.
I just don't know if it would be size-adapted since I don't have the Powergirl nor the Nightwing.
Great work with the alt. head John.