Set a pen tool as above and scribble across the canvas until you have a similar lock to the one below.
Apply the Filter > Distort > Wave effect with the standard settings. Then Edit > Fade Wave. Repeat this another two times but don't fade the wave on the last round it should look something like this.
Set the eraser as above and brush lightly across the canvas until you have a smilar look to the one below
Apply a Filter > Blur > Gaussian Blur set the radius so you get the required detail of airbushing Apply > edit > Transform > Distort to create the required shape.
