The phrase "nose wrinkle" refers to the action of creasing or scrunching up one's nose. It usually happens when something smells bad or when someone is feeling disgusted or displeased about something. Full definition
He wasn't sure about the pesto, and did some textbook nose wrinkling when referencing the «green stuff» but if nothing else his hunger won out. (bonappetit.com)
Although an over nose wrinkle is not explicitly encouraged, The Kennel Club (UK) French Bulldog breed standard specifies that skin on the skull and forehead «should be supple enough to allow fine wrinkling» [1]; and the American Kennel Club breed standard describes «heavy wrinkles forming a soft roll over the extremely short nose» [39]. (cgejournal.biomedcentral.com)
My daughter did a little nose wrinkling when I told her I was putting thyme in the lemon cakes, but she took it all back after she tasted them. (seasonsandsuppers.ca)