fail on the lightning effect (i cant work ps so i cant do it either), the text is fitting and the vibrancy of the armour the purple visor seems to be the main focal. but other than that.. its good
ok im not sure what gimp cannot do compared to photoshop (though i hear it is basically the same thing), so im gonna critique it like normal. all of your colours are overcoloured on the armour, ESPECIALLY the visor, i would lower the opacity on that one the most. next, your wisps didnt really turn out great sorry.. use an outer glow on them mebeh?