Those are pretty awesome. It is kind of a shame that they convey more life than the in-game assets they portray. You never realize how much "body language" can make or break stuff.
Paintjob plays a part... and then there is the fact that models does not have to worry about hitbox. But yeah, the pose matters. One thing though, is this the official PGI paintjob colors? Seems to give me that idea from the site.
Paint-job is just a rimjob to cover the fact that your mech-vehicle is under-powered and your skills are inadequate! It's a personal choice! But it has no bearing!
