Or maybe it’s the reverse–you’re a comfortable speaker, and it’s just that you haven’t given your expressions much thought when you speak.
So wearing a blank expression is just a habit of yours.
That’s an extreme case, but for most people a little physical warmup can help.
The feeling of intimidation can make you mentally choke, leaving you at a loss for words that makes you feel even worse.
Mix your I statements with frequent validations of what they're saying.
Most people just want to be heard and will relax if they know you're valuing their thoughts.
In fact, many speakers aren’t even conscious of when their facial expressions fall slack.
Many people find speaking to be a daunting task, and, nervous about seeming like they don’t know what they’re talking about, they go too far in the opposite direction–formal, tensed up, wooden.
He was intimidating because he was totally hidden behind a blank expression.