Here's what I'm not seeing:

-Clear lens glasses (even shop safety glasses would do) will really help cut the wind on the cheeks/eyes.
-thin cap on your head (that will fit under the helmet) and possibly an earband (like an XC or skiing head band) with overlap to the face mask (at the ears).
- shoe covers or baggies inside the shoes.

Other than that, it looks like what I ride in those temps (I have a thin balaclava, but that's the main diff)