The coding is in the preset_#.material file. .3. Hopefully the head coding looks like this make sure the JPG or PNG preset photo is named preset_#head.jpg or PNG (which ever one you choice to use. .3.) Hopefully this helps.. xD:
material preset_#_headMatR
{
technique
{
pass
{
texture_unit
{
texture preset_#head.jpg
}
}
}
}