My votes went to Zip and Mark.
As for feedback, I agree with everything Mark already pointed out earlier, but I'll try to make some additions:
Pantzar: The value grouping you did in your earlier sketch was great - keep doing that. One problem I noticed is that you didn't quite stick to that plan that you had set out. The values of the ground changed a lot by the time we get to the final, but you want to make sure everything still reads correctly from the thumbnail. You also have a few lighting inconsistencies. I think it would be helpful to think about the direction of your primary light source in 3D space, and reduce everything in the scene into mostly boxes, but include spheres, cylinders, cones and pyramids where needed. It becomes much easier to think about which major planes are facing the light source and which aren't. Once that lighting is mapped out and you have your main light and shadow shapes, feel free to refine the forms and think more about your ambient light sources. Also, try to use references for things that you aren't sure about (tree, arms, etc). In future pieces, I'd also like to see you experiment with many different thumbnails before committing to one. Be sure to start a sketchbook so that we can track your progress.
Zipfelzeus: This one is my favorite. Great content, great action, great colors. I agree with Mark that the canvas feels a little too tight around the figure. It could also use a bit more polish, especially the hands. One of the bigger problems is probably the handling of different surfaces. I assume that the ornaments are golden, but they don't really read that way. Don't forget about the blue light source of the sky, and really nail the mirror-like specular reflections of the ornaments where needed. Think about which planes will reflect reds from the cape and skin, and which planes will reflect some blues from the sky, etc.
Mark T: Very solid entry. The design has a lot of bells and whistles that really sell it. A few points: The top of his coat looks like it's reflecting blue sky light, but we don't see that anywhere else. His pose is a bit on the stiff side, though I don't really see any easy way of addressing that considering the complex anatomy. Some of your shadows feel like they're missing some color information, making his skin look sickly at places. Biggest thing I'd address is edge control - a lot of them are a little too sharp and uniform, especially his silhouette. I'm not sure if any of these points were things you were already going to address, but I figured I'd share.
jeremygordon: I like the character, but as Mark already pointed out, he could use a bit more context. That can be done through more details in the costume, showing a bit more of his demeanor in his stance, or even incorporating him in a simple environment (though I think you might already be doing that in the environment contest IIRC). Try to think through his back story and his world, and tell it to the viewer through the design. Don't be afraid to check out fashion blogs, clothing catalogs, etc to really learn about the subtleties of what this guy might be wearing. As for the rendering, diffuse lighting is very tricky to pull off well - a strong directional light source can always make things easier, and you can even tell a story through the direction of the light, the type of light source, and if parts of the character are in shadow. Plan these things out with small thumbnails. The rim light is a little inconsistent. Remember that they are specular reflections - try to put yourself in a scenario where you have a rimlight on your hand, then see what happens as you rotate and move your hand, move your head, etc. Try to get a feel for when rimlights should appear, and what they look like when they do.
Raymod: I like the scene and that you put your character in context. A few considerations: I like your limited palette but it feels a little too limited given the stylistic choice. I feel that more vibrant colors would work a lot better with the style of the drawing. Also, the hands, feet and eyes of the character seem a bit too large in that it's inconsistent with the other characters in the scene. She looks more 'cartoonish' that the two travelers, which is a little jarring IMO as they don't quite look like they belong in the same scene together. Other than that the piece is very solid in terms of composition, content, and storytelling.