Pastoral life
My top three:
1. Derfel Cadarn -Ramble On! -

This may just have been my favorite MOC in the competition. It's one of those where from the thumbnail you wouldn't even know it was LEGO, as all of the square edges inherent to the brick. That use of the headscarf piece as a traveler's pack is an outstanding part usage. Other than that, there aren't any specific build details to note here - really the effect comes from the perfect balance of this MOC rather than from any particular little trick here or there.
2. Skalldyr -Silence before Storm -

This is full of great build details, like all of the animals (the bird grabbing a fish out of the water is my favorite), the wagon, and that spiral stair built into the cliff. The best thing about this MOC, though, is the sense of motion. You can really feel the wind blowing as you look at this. It all works together - the trees swaying, that bird in the top of one being blown off, all of the flames blowing, the wave crashing and pushing the boat up against the shore, and perhaps best of all is the lamp on the side of the wagon being blown sideways.
3. Deviet - Walking The Goats -

Again, the sense of motion is what makes this scene. Here it is the water crashing down over the falls. Both the texture and the color variation work really well here. Against that, we have the very peaceful scene of walking the goats, which is a great contrast. The goats themselves are a nice design, as are the birds. Great foliage as well, and I like that bridge. Tree root reaching out beyond the edge of the baseplate is a nice touch.
Others, in no particular order:
Shmails' horses 
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The movement of the horses down into and then up out of the water is really nice here, including the bubbles being churned up as they go. The one horse refusing to enter the river is a funny detail. I'm not thrilled about the little slice of a house here. It doesn't seem to balance against the rest of the scene. Also, having a cutaway piece of a structure like that is fine in a vig, or some other setting with a limited footprint, but in a MOC of this size it seems odd to have no structures anywhere else, and then put a little piece of one in the corner like there was no room for it in the diorama. Oh, great attention to detail that the riverbottom (dark gray plates) slopes down underneath the water on both sides of the stream.
TooMuchCaffeine's Baa 
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I just wanted to highlight here the NPU of the ice cream scoops as wool.
Nanuck's gators 
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Some nice foliage here, especially the cattails, but the coolest thing is how the two molded gators are joined by three others constructed of plates, slopes, and some gator parts to make the submerged crocs. Oh, the one with feathers in his mouth is a nice touch. Shouldn't that be Betty White on the pier, though?
Hardegon's farm 
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Lots of loving attention to detail in this one, like the kids playing in the stream, the roof beams poking out underneath the thatching, the ripple where the cow is drinking. The landscaping and the curve of the stream and path feel really natural. The guy shaping the log is great and I wish there were clearer pictures of this.
Peter de Yule and the Wolf 
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Good landscaping and mix of different tree styles here. The shape of the stream is nice, though I wish the water were set down a plate from the surrounding land. The color variation in the waterfall is nice. I like the movement with the wolf jumping, though the wolves themselves seem a little too blocky.
LegoLord's farm 
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The really cool thing here is how Legolord did the undergrowth, by putting the large flat leaf pieces on the ground and then filling in the gaps with the 1x1 round with three leaves. That gives it a great texture and make it seem really overgrown (though perhaps more appropriate for a wilderness area than right next to a farmhouse, where you'd expect things to be more trampled down). The little fence for the chickens is nice as well.
Liwnik's barn 
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The thing to point out here is the way the thatching was done. Particular the irregular edge down along the eaves work really well, as does incorporating some tan log bricks into the normal bricks. I don't think those tan plates laid over top work at all, though. The three different bird designs are another outstanding detail.
ACPin's caravan 
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The mix of tan and dark tan is really nice here (though the camels get kind of lost). Good landscaping, and an interesting idea to offset the four 16x32 baseplates by 12 studs each time to change up to overall footprint.
Jalkow's shepherd 
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The bird in the tree, the wall, and the placement of the shepherd's things are all great. What makes this memorable, is the parts usage of building it on top of a boat hull and, of course, the dino head for a blanket.
Athos' pigs 
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The gate is a nice structure. I particularly like how it's all one color, but he uses texture to make it interesting. Some nice variation inside the gate as well. The negative here is that this is really not at all a 'pastoral life' scene. It really feels like Steve was set on making a gate, or maybe even had one partially built before the contest was announced, but his planned MOC didn't fit any of the categories, so he just threw in some pigs and called it pastoral.