Your Fire Tyranitar looks awesome. I don't like the fire on his head, but the flame body is amazing. He looks almost glowing. Maybe you can put the fire behind his crest so it'll appear on his neck.
Tut makes me giggle, but I'm not sure what tutorial to show. Fusion or recolor. I have both, but they're really simple. D: And the Tyranitar is a little more advanced. Do you use Paint? That'll help me to help you.
I use Paint, but transparent the background. =P
The more I look at it, the more I see that I could be mistaken. I'm not sure if the back of Tyranitar's crest is lightly colored or not. But you could probably take a normal Tyranitar, cut the crest off and put it over the Fire Tyranitar's crest. Recolor and it could look like the fire it behind the head instead of flowing out of it.