Distort the shadow on the necessary direction (opposite one from the moon), using: Edit ? Transform ? Distort.

how to make a dream catcher photo effects

Blur it out (Gaussian Blur).

how to make a dream catcher photo effects

Change the layer's Blending Mode on Soft Light.

how to make a dream catcher photo effects
  


Then select the Brush Tool of star shape and the Eraser Tool and place the stars in the box:

how to make a dream catcher photo effects

Make a copy of this layer and blur out the copy (the same way we did with the stars on the sky) and change the color of the blurred layer (It's necessary for it to be placed under the basic layer), using Image ? Adjustments ? Selective Color.

how to make a dream catcher photo effects