I think you could have improved the textures of SM64 Mario.
You should have clamped the textures that didn't need to be tiled instead of resizing them, which caused stretching. The textures which need to be clamped are the "Buttons", "Eyes", "Hair_Piece", "Logo" and "Mustache" textures.
Also, you should have consistency with your textures. The textures mentioned above, the Shirt_Cap and Skin textures have a 1-colour base, but the other textures are 2-colour gradients.
Basically, here's what the textures should look like:
However, the rig looks perfect. You did a wicked job fixing up my model and I can't wait to see other model-port work from you.
btw, would you have any use for SM64 Mario's hatless hair model?