the prompting for facial expressions within gemini isn't quite the same
I always used 'sassy tired smile' in dall-e but that doesnt work so well in gemini
here's some to try

>playful smirk, subtle cheek lift.
>soft closed-lip grin, subtle cheek lift, warm expression
>playful smile with slight head tilt and raised eyebrow, natural sparkle in eyes
>smile expressed mainly through eyes, gentle upward curve of lips, soft gaze
>elegant closed or slightly open smile, subtle head tilt, strong eye contact, conveying editorial confidence.