Ok this is my first time trying to do a texture hack and I decided to try it with Pikachu and turning him into a Quilava. I apologize cause right now I am using MikeYoshi's pikachu model to try to make it. I love playing as Pikachu, but my favorite pokemon is Quilava and I am desperately trying to get this to work and I am stuck about 90% of the way through and I have no clue on what I should do.

I know, complete noob trying to make a texture that is hecka lame, I know don't tell me, just help me
See on the face, it is perfectly square at the bottom where the green touches tan. I don't want that I want the either connected to the tan on the belly or just make that dang box disappear., but I figure out a way to just connect to the belly, there is a huge tan box on the back of his neck which is completely noticeable. If anyone can help I know I would appreciate it. I know that using the model MikeYoshi made with Bowsers hair is wrong, but I asked so many times for a Quilava model over Pikachu and everyone just said: Oh there is a Typhlosion for the pokemon trainer. I don't want Typhlosion I want Quilava. I know I really am not deserving of help, but please at least help me make my Quilava in brawl wish come true :<