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.
Finally the lower legs of the MP 2 Varia Suit look like the MP 1 Varia Suit legs.