I have always strongly believed that Presentation has lot to do with art, Especially when it comes to more physical or functional art. Here you have done an excellent job, the photos are many, and they are nice and crisp. I can see the detail very clearly. And you have taken time to remove all the white background, nice.
I think I goaded you in to going a bit overboard one the presentation this time. I would even say I may have agitated you a little, but by pulling out the stops like this, you have given the audience what they wanted. This is the type of thing you want when showing off your future creations.
The multiple photos help a lot. In the old one, I couldn't see much. And to be honest I thought that the foam was an awkward shape that you had wrapped around itself. I Personally though that it looked tacky and lacked design. But here I was, unable to see the rest of them. Now I see that for your main backing that you have these disks rather than one bulky piece. This lends the gauntlets a more traditional feel.
The backs of the Gauntlets are alright, I will mention that I think you could use some accents, symbols, or runes or something to help them stand out a little more.
You mention the stress fractures as a bad thing, but I think they are good. Take some darker paint, a dark brown or a black with some metallic properties and paint along those stress fractures. Make them look deeper like older cracked armor. Just because the Gauntlets have been well used, doesn't mean they lose appeal, they gain character.
The duct tape is a little messy, not for the paint chips, but just a little messy, although the fingers look pretty nice.
The gloves do look a little stiff though. They might be softer than I'm thinking, or even nicely broke in, but it still looks stiff. It makes me wonder what you could do with some leather work gloves or something. I think you should do a second set, but with a broader set of resources this time. I think you'll be amazed at your creation.
One thing I would like to see in the future is you putting some of these mods and creations in to action. Once you get a full array of costumes and accessories built, I think you should start taking a few photos of them in action. Talk one of your buddies or something in to holding them or dressing up for you, so on and so forth. Although sadly I think that crosses the line about the Portal's no photography rules. But that doesn't mean you can't put them in your thread. I would suggest starting out by having a few shots of your arm with one of these gauntlets on holding one of your guns. Meh, its an idea for you to toy with.
Oh yes, one last thing. Although I find Guns intriguing, I find the elegance of a blade much more fascinating. Any plans to do some swords or knives in the future?