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Create another Curves adjustment layer to brighten some parts of the planets, especially the left. On this layer mask, use a soft black brush to reduce the light on their middle and right.
Make a Curves adjustment layer (set as Clipping Mask) for the planet on the left to increase its hazy to fit the misty background. Use a soft black brush to reduce the highlight on the left.
Create a Gradient Map adjustment layer on top of the layers and pick the colors #36434d and #9fb4c2.
Make a Curves adjustment layer to darken the scene. On this layer mask, use a soft black brush to erase the left to reveal the light there and make some contrast for the whole scene.
Add another Curves adjustment layer to increase the contrast and depth of the whole scene.
Use the Rectangular Marquee Tool to make three selections on the columns (hold down the Shift key to make the second and third selections). Go to Layer > New Fill Layer > Solid Color and pick the color #1d282a to make a shape on each of the columns.
Double click this layer, choose Inner Glow. Set the color of glow to #728083.
On the mask of this color fill layer, use a hard black brush to refine the top and bottom of the shapes to fit the perspective of the columns.
Make a Curves adjustment layer (set as Clipping Mask) to make the shapes on the first and the third columns brighter. On this layer mask, paint on the second shape's area so it won't be affected by this adjustment layer.
Make a new layer and use a hard brush with the color #85cad9 to paint some lines and dots along the columns and shapes. Hold down the Shift key while painting to make the lines and dots straight.
Double click this layer, choose Outer Glow. Set the color of glow to #2fc8f3.
Add a new layer and use a soft brush with the color #c6dcdb to paint some glow for the lines and dots created in the previous step. Change this layer mode to Overlay 100%.
Make a new layer on top of the layers and set the foreground to #85cad9. Activate the tech brushes and select binary1 one to paint on the top of the first column. Convert this layer to a Smart Object and use Ctrl+T to scale it down and distort it a bit to fit the form of the column. Duplicate this layer to make the brush's effect more visible.