Below is an expressions set I created
Most of it was based off a great reference for facial emotions found here

7th_faces.zip – expressions set
Extract the zip file into your mod\expressions folder
This set contains the following expressions:
- Attention
- Determination effort
- Doubt
- Disgusted
- Happy
- Smile
- Laughter
- Surprise happy
- Surprise
- Upset
- Shocked
- Fear
- Sad
- Worry
- Cry
- Scared
- Angry
- Mad threaten
- Shout
- Neutral (if there are no key values found in the neutral expression; then reconfigure every neutral flex slider with a 0 value key, I use to this expression to revert to the neutral facial flex)
I also a found a simple set in the Valve developer wiki (conclusion section) here
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