explosion
original image

Entry guide: step 1 of 6

I isolated the splashes in a new channel then loaded it an a new layer
Entry guide: step 2 of 6

copyed some parts to hide the man that was still shoving a little bit in the image
Entry guide: step 3 of 6

i added layerstyles inner shadow outer glow inner glow and a yellow color overlay
Entry guide: step 4 of 6

I made a blured duplicate n changed the blending option to... lighten..(i guess:P)
Entry guide: step 5 of 6

on a new layer i just painted some red
Entry guide: step 6 of 6

flatend the image made a duplicate n changed the blending option to screen..then an other duplicate with blending option to screen but with opacity at about 60%,u can see that in the end result
final result

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