The way that you've done faces is excellent and the sheer volume of textures makes this an impressive resource.
The quality overall is easily sufficient. There are little nitpicks that I could make, but nothing major enough to prevent approval.
I think you're at a pretty good stage texturing-wise, can I recommend that you try working in a higher resolution? If you can properly conserve detail for the best quality at in-game camera level, it can produce a very clean effect when resized. Just a thought :)