Then, bring back the transparency level until it looks as natural as possible! (I forgot this step in my pic!!!) Then, using the Gaussian blur, blur the layer.
And VIOLA! Explosion and Helicopter crash! The more time you work on these Techniques, and the more effort you apply, the more natural and professional your pic will look!!
![](http://i106.photobucket.com/albums/m251/ender098/explosions11.jpg)