Post a few adds at universities with graphical design courses. Say it's a three month commitment at first (to prove themselves) and the person would need to sign a non-disclosure agreement. After 3 months an extension can be offered. There will be no pay other than (free game + putting creations in portfolio). These kind of things usually can attract quite a lot of attention.

I tried my hand at 3d graphics and I tried making a sword. In the end, it looked like some kind of short dagger.
And a helm.

What do you think ?