I was planning on using this scene for the challenge, but got "postworked" away... Just wanted to post a small tut on how i did the atmosphere in case anyones interested.

I spent a great deal of time messing with the haze/for settings, but couldnt get the look i wanted, so the base image is made out of two separate renders.
On the top one, i placed a cube with a water surface just infront of the camera, to get the hazy look. The bottom one is without that cube.

Once that was done, i opened up both of them in Photoshop, and placed render 1 as the background and 2 as a new layer. Gave it a layer mask, and erased the top part.

Next, i flattened the layers, and duplicated the background. I set the new layer to "Lighten" and then added some Gaussian blur to the layer. I set the opacity to around 40, but this is just a matter of personal taste. The more blur, the more haze. I duplicated the first layer a few more times (probably more times then necessary), but for these i used "Multiply", other then that its the same procedure with Gaussian blur and playing with opacity. I used a layer mask to highlight some parts

Next, i drew som fishes...

Saved, and opened up the image in Universe for the lensflares and some reflections. When that was done, i brought the image back into Photoshop to add a few lightrays and a little haze between the structures on the right. Done! Hope you can use this. :)

Thanks! This is very helpful. Peggy

Nice workflow, too! This image is outstanding, and a great piece of art my friend. (bows to you)

Thank you so much for the mini tut, and the insight into how you achieve such awesome images! Your scene definitely got my vote!

Thanks Rudy!

Now that is impressive! I even liked it before the post work... But the extra work really does add to the final image.

Very insiteful! Love your PS layer and filter work!

Always a pleasure to view your work and when I get a chance to read a tut from you, it's an added bonus, thanks! An excellent scene deserving of a vote and your workflow is an inspiration.