After completion of face, reveal clouds layer and mask out face.
step 6 of 10
Render black/white clouds on new layer
step 7 of 10
Render black/white difference clouds
step 8 of 10
Image/adjustment/invert to reveal lightning strikes.
Image/adjustment/levels to enhance lightning.
step 9 of 10
Mask lightning off face.
Change blending mode to luminosity and reduce opacity to 20%.
step 10 of 10
Saved image as jpeg. Opened newly saved image to convert to HDR appearance using tips from this tutorial: http://www.pxleyes.com/tutorial/photoshop/1090/Pseudo-HDR.html