Mineflare's Steampunk Vampire Slayer.
I guess I'll start from the head and work my way down. First of all, the shading, is just fine, so there isn't much worry there, except for a few places where the faces don't match from one side to the next. The face is unremarkable, bordering on kinda boring. Now, granted, the steampunk contest has been pretty liberal with the application of scars and wonky head gear. Which, incidentally, leads us to your headgear.
Now, I like the idea of the goggles, but I've got two big problems. One, the goggle is floating above your head without actually making contact. Which gives an unpleasant visual effect of the goggles floating around your head, making it appear to be some kind of low hanging halo, and the grey thing (gears?) gives basically no additional flare.
The next thing is the legs. I get the belt is laying right on his hips, instead of his waist. It's a common thing, and in the last month or so, I realize I've done the same thing. Poor practice on two fronts. One, you don't wear a belt on your hips. You wear it on your gut, which, on model, is approximately lines 3 and 4 from the bottom of the torso section. I wouldn't bring it up, except that when the legs move, and if the body is view from any low angle, an unfortunate effect happens. The belt 'splits' and you can see the robes(?) between it. Now, if this is supposed to be a double belt, that'd be one thing, but that doesn't appear to be the intent here. My last problem, is that the vampire hunter looks less like a vampire hunter and more like a particularly religious handiman.
The thing is, when it comes right down to it, this is a perfectly good skin. It just doesn't look anything like what you're going for. I feel kinda bad, but that's my honest opinion, man. Like I said, great skin, but just... not what I'd call a Steampunk Vampire Hunter. Great idea, but not really executed. Not executed poorly, which would be one problem. But it's a good execution of something that just wasn't the initial idea.
Dagorex's Billy skin
Now, this skin fits with the minecraft tone. Not so much in it's actual theme, but in how the shading is done. It's weird to explain, exactly. It's not shaded in what one would typically call a good way, but it just... looks like a Steve. Some might mean that as an insult, but I don't. I like it.
Now, I have a few nitpicks. One. The boots and feet are perfectly flat on a skinwith a lot of noise detail, which really throws the eye for a loop. Now, as a note of detail, or, a few, rather. The jacket is unquestionably straight, with absolutely no tapering or flowing open or closed, which immediately clashes with the visual representation of the random buttons down the front of the jacket.
Next. The mask. First and foremost, the goggles seem like they should be raised from flat to the head, given they're supposed to have a major effect on his vision. The top of the mask is... well, confusing, to me. It just kinda looks like... Well, I don't really have anything to compare to. It's just kinda... flat and squarish and weird. Also, where the face is exposed, particularly around the rear right panels, the way it lays is almost too clean, at least to my eye.
Lastly, the jet pack. I really feel like it's just sitting on his back without any sort of brace. Now, I won't suggest what I'd do, because that would make it my skin, not your skin. And we ARE making YOUR skin here. But as it stands, it lacks any real connection to the body, aside from being there. It looks less like a back pack and more like a logo. Nextly, the coloration is a little... well, you ever hear the Teal and Orange phenomena? Yeah. You're doing THAT in spades. I dunno if it's intentional, but the blue of the water is too vivid, and the orange of the bronze (I assume, although I guess it could be a glass case of lava) are a bit too bright, and look less like water and bronze, and more like coolant and some indescribable orange mess. I'd really work the coloration and shadows differently.
Hope that helps, sir.