I like the design. But the happy one looks more like "hiding something". You know like, when a mother asks her child did you break this and the child looks at mother like Happy looks.

Shocked seems more like a "duh" face to me. These faces don't show that much expression either. Only a tiny bit, and it seems a bit too stiff too. The first 2 look good though.

I will still give a 4/5 because I like the character design. :3