Here are more design concepts by other artists / designer!
Concept Art - Marines for Exatus
Credits: https://www.deviantart.com/noosborn/art/Concept-Art-Marines-for-Exatus-267420565
Concept Art 02 - Excelior Suit
Credits: https://www.deviantart.com/zerofrust/art/Excelior-Suit-197558204
"We're working on new male pilot skin. Our art style is pretty open. What would you like to see? A crysis style suit? A ninja? Let us know."
All credits goes to owner. These are only references and ideas.
Please post more if you see anything good. But don't forget to leave credits.
NASA...