The Hannya Mask is in the bunker basement where Lara finds the Pry Axe. You may examine this relic for more experience points. Turn the mask to see the insides. The Female Noh Mask is in the second ...

You'd be hard pressed to miss this one. Remember where Lara first got her hands on the Pry Axe, down in the flooded area below the bunker? There's a table in that area that holds a little chest on it ...