Just something I whipped u yesterday. I know shoulders are a bit off on Power suit, but....
I used subscreen from Metroid Prime: Hunters as a base.
Comments and critics please.
The lower legs on all of them look disjointed to me. Also you should remove the details from the notches in both shoulders of the MP 1 and 2 Varia Suits, the Gravity Suit, and the Phazon Suit. You can't normally see the details in the shoulders' notches from a sideways view unless Samus is facing sideways or you put emphasis on an aerial viewpoint for Samus.
Finally the lower legs of the MP 2 Varia Suit look like the MP 1 Varia Suit legs.
Good sir, you are attempting to steal my heart.
I would only think the Phazon Suit (Metroid Prime 1, opposed to the Metroid Prime 3 suit) was darker on the legs, arms and shoulders. However I haven't play Prime 1 in years, and my memory may not serve me correctly.
The Dark Suit (Prime 2) looks alittle pale to me. However I'm deviously colourblind (oh woe is my X chromosome), so it may just be me.
Besides those remote possibilities, I love the work.