You don't see these kind of expressive masks very often and that has a good reason. When going with such a expressive mask you're taking a big risk that it looks forced or stiff. But your mask looks really good! The smile is just the right size, doesn't seem to forced (to me anyway). I don't know the character, I can already see he is either planning something mean or is ready to ruin someones day!
After looking him up I must also say the cosplay is spot on, good job! Maybe make a deamon version/expansion some day?
Another great job from Ride the pigs studios.
"The creature took on the host's appearance, abilities, everything. It sucks everything dry. Can you not see that if a mimic such as this were to infiltrate a population, it could replicate almost indefinitely!"