Result:

how to create glow effects

Now make 2 copies of Magic trail layer and Resize them like this ? and set the position like this:

how to create glow effects



how to create glow effects

Now copy the smallest layer several times ? (on upper picture it is ? Layer that has #1).

So here is what I did. It is very important the position of the layer. + I suggest
  
you to create a layer Group (if you are using PhotoShop CS of higher) ? our group will be called ? TAIL!

how to create glow effects



how to create glow effects

Now it's time to position all this crap. I will choose to set them in this way.

how to create glow effects

I've used Drop Shadow on layer 1 and 2 (on the Picture).

how to create glow effects