Turn any photo into a dot grid artwork with these Photoshop actions. You'll get great results with dots that change size. They get larger in brighter areas and smaller in darker areas. Free download available.
Create a new layer, set color #a09081 and brush Opacity: 40%, use created brush to draw fog on the alien's legs and a little around. With the weather or situational effects can be achieved by masking the unpleasant parts or hiding unwanted elements. With skillful use of surrounding opportunities as possible to achieve realism, but only when you know the limit :).
The resulting color of smoke seemed to me too bright and I added an adjustment layer "Hue/Saturation" to the fog combined with the colors of image. In "Hue/Saturation" set Hue: -9, Saturation: +11, Lightness: -11 and applied this layer to fog layer.
Here is my result. Layers with aliens, I also combined into one group "Aliens" (Cmd/Ctrl + G). Next all following layers should be higher than the two groups with the scenery and aliens.
Proceed to part with addition of fire and pieces of dead aliens. I decided to add these pieces to convey a sense of the battle. As with the aliens, and their parts move them to a working document (Step 17). Place the parts in the right places. In resource image only two pieces, but experiment with the rotation - connection of both and you will get more (use Transform Tool (Cmd/Ctrl + T)). In this way I made the third part. When you are satisfied with the arrangement of the parts, merge all layers with pieces in one layer (Cmd/Ctrl + E).
To create a shadow under these parts I used style "Drop Shadow" (Layer > Layer Style > Drop Shadow... or icon on Layer panel). Set Opacity: 100%, Angle: 151 degrees and set checkbox on "Use Global Light", Distance: 33px, Spread: 0%, Size: 100px. When you are finished, press OK.
Color of aliens items are not combined with the general atmosphere, so I will change this by using adjustment layers. The first layer is "Brightness/Contrast". Set Brightness: -92, Contrast: 46. So I darkened the parts to prepare them for the imposition of the desired shade.
Now color. Next adjustment layer is "Color Balance". Set for Midtones: Cyan-Red: +16, Magenta-Green: -16, Yellow-Blue: -26; for Shadows: Cyan-Red: +6, Magenta-Green: +9, Yellow-Blue: -10. Since in the original form of these cases were much brighter, then tab "Highlights" a don't use. Now all the parts are harmoniously combined with the color gamut.