Normally I don't do this kind of thing, but I have spent the last 4 hours trying to get this to work with no avail(not including the time spent yesterday)
I'm currently using this mod here
http://www.gta4-mods.com/player/reimu-hakurei-f13879 and I used both Open IV and Spark IV multiple times and followed the instructions 100% correctly.
However, when I start up the game it looks like this.

It takes on the textures of what's the clothing on in the game and the teeth are out of the head. I'm not using anything else by the way, all I've done is swapped the files with Open/Spark IV a few times. If anyone could help I would greatly appreciate it. Or possibly set me up with a playerped.rpf file that works with TBOGT.