Hi Malcom. Great job so far!
(Your first sketches remind me so much of Marc's character art btw 
)
I really like the last one on the right, but maybe would make the armor look a little bit more feminine if you know what I mean. I think the idea with sort of tatoo in her face and kind of diadem looks also cool. Would try giving her two bi**-a** guns and see how it looks (gun concept n.3 looks quite badass) or maybe a gun and a mech-sword. 
Sadly I didn't have time to join the competition yet, but obviously I am going to be on the opposite side, but anyway looking forward how your character will turn out and you have my full support!
Keep it up! 
but, lets get to the point, your guns, the guns look awsome and for the sake of weight I would choose a bullpup design (magazine thingy is behind the grip, makes it more compact) so you might want to take inspiration from the Famas a french made bullpup rifle. so it isn't that bulky, good for CQC well, decent a smg or shotgun would shine there. but you also get a good amount of accuracy and range. very important, a variable scope that is linked to your visor is handy for zooming in and more accurate shots. a electromagnatic rife or guas rifle (think railgun) might be more sci fi though, it doesn't use any chemical reactions to ''fire'' the gun, so no smoke trails for tracking you in the distance, no bullet casings to use as clues/breadcrumps. you get it probally. a energy weapon that shoots plasma might be a bit too power consuming ,since it uses a electromagnetic field to keep it enclosed, which needs to be supplied with (1)power at a (2)distance while (3)traveling, and removing it just before impact. its strong but probally still only on a big space ship. 
and you can use the helmet to lift the limits humans have on their view width. you can create cameras around the helmet so she can see a 360 degrees around her at all times. so no rogue will think of sneaking up on her back! 
maybe add some kind of external skeleton on the suit (exoskeleton intergrated into the suit) for maximum awsomeness 
) it kinda just came out like that. 
Field of vision is definitely important. I will have an drawing of an exoskeleton. I was thinking of her having some kind of nanits that can become anything. Think Bayonetta with her hair being her clothes but nanits instead. A knife on the hip? Got it. 
I believe the reason I have a lot of Marc influence is because seeing his art and watching his videos is why I started doing art again. Honestly didn't know who Moebius was so I quickly looked it up. Interesting stuff there.
!
