It contains 83 player photos (first team, reserve team, youth team), but no staff.
Photos are 260x310 pixels, showing all the upper body in official shirt and not just face.
How to install the facepack:
To install this facepack, unzip its contents to your "graphics" folder at:
\Documents\Sports Interactive\Football Manager 2018\graphics\
Optionally (for better organization), you can create an extra folder there and call it "faces" and move the pack there.