how do you make and add head textures?

1) Get Head Texture (Alternatively, you can get head textures with 256x256 and 512x512 resolutions. They cost 10k and 20k, respectively)
2) Go to Textures page
3) Press Browse and find the flat image from your computer, and then press upload
4) Open Toribash and wait a bit until the texture downloads on your Tori
5) fap to your new texture

do you have to buy them

Yes, if you want everyone to see them. If it's enough to have you see them, save the flat head texture file as head.tga in Toribash>Custom>Nobrain98.