First one:
The render is pixelated, I can see how you tried to pick the background, the fire ball totally kills all of the effects and doesn't have fit in with the rest of the colors. The text doesn't seem to match
Second one:
Same thing I said above except the fireball.
Third:
well it's the same as all the other one's except you added one more gradient map.
Sorry but you need to look up some tutorials.
They really do help.