I've added the .obj file to the OP for those of you who want to test their .tga textures in game :)

Also I made a whoopsy and added a .png file of the texture to the OP but not the .tga file of the texture. I've added the .tga file available to download in a link just below the picture. It's ok if your design is a .png rather than a .tga, you just need to change the file type using paint.net or some other software.

To test ingame, you need to add the .tga file (named head_obj.tga) and the .obj file (named head.obj) to your custom folder. You then need to open item.dat in notepad and change the line which says 'OBJ0 0; 0 0 0 0 0 0 0' to 'OBJ0 0; 1 0 255 1 0 0 1'