A "quizzical expression" refers to a facial expression that shows confusion or curiosity. It's when someone looks puzzled or questioning about something. Full definition
Having said that, for far too long licensing and rights were often words met with quizzical expressions among the writing community. (independent-authors.com)
The two very businesslike men in the boardroom had quizzical expressions on their faces, and when one left to get the spreadsheets, the other one said that out of everyone they had interviewed, I had been the only one to ask to see spreadsheets. (remonline.com)
The tallest of the spaniels, with a unique quizzical expression, the Irish Water Spaniel has a distinct, purposeful presence. (dogbreedstandards.com)