To get the “depth of field” illusion, we need to use Filter> Blur> Gaussian Blur menu. Adjust the Radius value around 1,5 px then click OK.
Next, we add another feather with the same technique as the previous one. Place it on top left corner, and apply the Gaussian blur filter again, but this time use Radius 1px.
Add the third feather on the right side of the red circle, above the bird. Use radius value 0,5 for the Gaussian blur filter.
Make sure you already got the lens flare pack from here. Go to File> Place and select the lens flare image you like to insert, mine is “optical-7”. Hit Enter to apply the image as a smart object. Oh, and don’t forget to place it above all layers.
Using Polygonal lasso tool, create a selection like shown in the example below.
Click the add layer mask button to convert the selection into layer mask.
The most important things, change the blend mode to Screen to hide those black color. Now you can easily transform the lens flare as you wish.
Duplicate the lens flare, place it between the bird and dancer as shown in the example below. Congratulations! you’ve done creating the poster :)