There was a twinkle in her eye when she talked about her new project.
У нее был блеск в глазах, когда она говорила о своем новом проекте.
Definitions
A 'twinkle in (someone's) eye' refers to a lively, mischievous, or joyful expression in a person's eyes, often indicating amusement, affection, or a secret. It can also mean an idea, plan, or person that is only just beginning to form or exist, especially as a hope or dream (e.g., 'He was just a twinkle in his father's eye' means he wasn't born yet, only imagined).