Aight I got a few things on this one,
The tekst is nice, but pritty big and kinda misplaced in my eyes, since its totaly in the center of the signature and takes all the atention away
The effects and blending look pritty good , might wanna do some more to it since its a bit boring, like get some more color in it, or effects that go with the flames , also the white brush on top of his head looks to mainstream..
A better way to do lightning is to use burn/dodge, or to go to filters>render>lightning effects, becouse it will look more natural
Not bad man, I would love to see some more later on