"Dramatic flourish" refers to a theatrical or exaggerated gesture, movement, or action that is done with flair and adds excitement or emphasis to a situation. Full definition
As Hugh Jackman's Charlie insists, when describing one of his own dramatic flourishes: «It's a show. (slate.com)
The film's cult has largely sprung up around the depiction of Doc Holliday, which — though sentimentalized and painted in broad dramatic flourishes — gives Kilmer what's easily one of his juiciest screen roles. (grouchoreviews.com)
Each character's plight is woven into that of his or her fellow travelers, and the storyline succeeds as readers get to know the foibles and strengths of each one, depicted in a natural and unforced way, without the fake dramatic flourishes that often diminish a story of this kind. (bookpage.com)