Converting a Daytime Image Into a Night Scene

Step 1.

In the first step remove the sky  from the original image.  You can use the pen tool or any other selection tool  for removing the sky. I have indicated the area to be removed with the red arrows. I have used the pen tool to select the sky.

This is the image we get after removing the sky. The removed sky is pasted on another layer.

Step 2.

Now go to Blending options> color overlay . Select blending mode as "Color". Choose the color #56c1ff

Step 3.

Now go to blending options>gradient overlay. Select the gradient "yellow-green-blue". Now set the blending mode to color burn.

Step 4. 

Now the image looks like this with the pasted sky layer.

Step 5.

Apply the effects color overlay and gradient overlay to the sky layer. The same options are applied as mentioned in steps 2 and 3. Now the image looks like this.

Step 6.

Now add the moon. Click the image to download the moon image.

Step 7.

Change the blending mode of the moon to screen.

Step 8.

Apply blending options> outer glow to the moon.

Apply Inner glow to the moon. The settings are as shown.

Now apply Satin effect to the moon. The settings are as shown.

Now apply color overlay to the moon. The settings are as shown.

Now apply gradient overlay. The settings are as shown.

Step 9.

Now with a small sized brush(1-2 px), draw the stars.

Step 10.

Now apply outer glow to the stars. The settings are as shown.

Step 11.

Now adjust the levels. The settings are as shown.

The final image we get: