Looking from concept art to current model, a few things in comparison. To understand what I'm talking about I'd recommend looking at current VS MAX screenshots and the original concept art all found in the media section
Head
The head on the concept art is smaller than the model. In concept because the body is larger and more elongated the head will naturally be smaller. However the ingame model head/helmet is in proportion as if the MAX suit is standard size causing the arms to appear thin. The TR is a good example of the head remaining normal human size in a large suit in concept art and ingame model. They need to redesign the VS MAX head.
Arms
The arms in the concept are twisted with overlapping curves and suit stuff making it look alien and not human. For that organic look it does not follow the human muscle layout as you can see in the concept. However the model is polish surface with minor differences in the texture. It looks very human and not much organic as it looks like armor plated onto the muscles. Return to a weird organic alien look with not normal muscle composition with the details of the what looks like in the concept large veins of muscle flowing over each other.
Shoulders
The concept has distinct space between the shoulder pads and neck showing some impressive organic muscle neck armor that makes it look intimidating, followed by the shoulder pads themselves that flowed into sharp points revealing tech beneath them as if it serves some purpose. The shape is also slightly organic following sharp curves. While the model is roundish bold shoulderpads that squeeze into the neck. It doesn't look very alien or organic. More like plated football shoulder pads that end pointy. Make them more organic and seem like they server a purpose besides being bulky armor which seems more like a TR or NC thing. VS aren't about the bulky, were about the sleek armor.
Weapons
The weapons are not in proportion in the ingame model. While the concept was sleek, porportional, and thin where it needs to be. It is part of the arm which is one of the defining features of the VS MAX from the others, intergrated technology. Make the weapons start from the elbow like in the concept and make it sleek and elongated through the rest of the arm and continuing past.
And the legs, same thing with the muscle comparison in the arm section. Overall the ingame model needs to look more elongated which done right will make it look more alien and the armor/muscles need more touch up to not make them bulky. More curves and twists.