I think your texture needs some more work. It being so large, I would expect to see much more than just plain colors, perhaps a pattern of the fabric that is present in normal and specular maps. It's hard to tell what materials the suit is made of. Right now it looks like the whole model is just a plastic figure. The visor would look much better with a nice reflection map. Not sure how much your design has in common with attempts to come up with a suit suitable for Mars walk, but to me right now it looks more like a motorcycle suit. Maybe look at Mars spacesuit prototypes, like the ones that were on trial in North Dakota.
I reckon that something like the yellow suit with black stripes would be visually much more engaging and it would be more fun to work on.
I just had the opportunity to see the shuttle Discovery take off some three weeks ago, now that I live not that far from Cape Canaveral and I'm all into reading NASA news, so I look forward to see where you will take this model and I hope you can make it really stand out.