Set the brush as above and brush across the canvas until you have a similar look to the one below.

Apply the filter --> Distort --> Ripple Effect with the standard settings repeat a further four times until you achieve the look similar below.

Apply the Filter --> Blur --> Radial Blur Zoom 50%
click Edit --> Fade Radial Blur --> 75%.

 
 
Set the eraser as above and brush lightly across the canvas until you have a similar look to the one below.

Apply a Filter--> Blur --> Gaussian Blur. Set the radius so you get the required detail of airbrushing Apply Edit --> Transform --> Distort to create the required shape depending on the blur applied it should come out something like below.   
 

Here is an example of it in use.