if you can find your way around the scripts, try looking at the character definition files, and track down the textures from there.
or, call whatever texture you made.
you might want to check the SDK files because they're simpler. I think the function you're looking for was CreateCharacter(), might be near the beginning of the file.
you'll find it has the path for all 3 detail levels. be sure the texture you need will load in the detail level you're using.
if it seems ok, then the texture file might be damaged, but I think that would show the white model MLeo said.