The first model of this thread looks pretty good, the texture really needs some work though, it seems like you just took a semi-white'ish background and used a brown grunge brush on the borders and applied it as the texture. It gives it a very mechanical look and such. I'd suggest maybe just refinging the general material under the grunge and soften the grunge itself by quite a bit, seeing as it's what's taking up most of the viewers attention at the moment.
The human is pretty good, the body of your human does really need some work edge flow wise, mostly since your edge loops that are running through the body are completely straight, which doesn't flow very well with how the body generally works. You want it to flow with the body, not against it, to manage this just try to rotate the edge loops a little bit in the X axis as proper with the body itself (Just google image human edge flow and you'll probably see what I mean).
You also seemingly tried to do some defining below the neck right there, which I'd suggest removing right away in place of either nothing or maybe some pectoral definition, what you have now isn't really in place with the body. Or if it's supposed to be some collar or similar for maybe his jacket I'd recommend rethinking how you made it, seeing as it doesn't, as previously stated, really fit in too well.
One of the main issues of your guy currently I'd say is the shoulders, they're completely flat and shows nothing whatsoever, they don't seem to even be existent. So unless you'd like your character to not being able to move his arm properly/at all I'd suggest maybe dropping that obscure sort of tilted feel of the shoulder that makes it just completely disappear from vision and pull it up slightly and adding some maybe very slight deltoids (?), seeing as it looks like your guy is wearing a vest of sorts.
Then the other more obvious issues of your character are the crotch, the legs, the arms and the hands. The crotch just needs a complete rehaul as, heck, it doesn't seem to exist at this point, right now it just looks like his torso goes straight into his legs. Again, you should be able to find images of human edge flow from google which could show you what you should to with the character. How I do my crotches, which by all means aren't even close to perfect but it's a technique I like to use is that when I've done the torso I select the two most edges closest to the center loop both on the front of the torso and back, and then extrude those a few times, scaling them in whilst doing it, until the eventually touch; which is where I connect them both together by merging the verts. This creates a leg-shaped hole or so that I can just attach the legs too and be happy.
The arms are very flat and weird of shape, the shape issue mainly probably comes by the fact that your guy lacks a shoulder and also that, as with the torso, your edge loops are completely flat. Just read what I said to the torso and apply it to here more or less. The same applies for the arms as the legs.
The hands looks plain odd seeing as it looks like they're really completely flat, but this is quite understandable as hands usually are an enormous hassle to make, let alone make proper. There are a few tutorials online that covers hand modeling, this being one that I'm personally very fond of:
http://www.youtube.com/watch?v=J1mExXURsWk&feature=channel_page
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The head I won't comment too much on seeing as it'd require a lot of explaining a simple google search could probably do a lot better.
Alucard94, the member of the future of the past.
