doe-eyed

US /ˈdoʊ.aɪd/
UK /ˈdoʊ.aɪd/
"doe-eyed" picture
1.

having large, dark, innocent-looking eyes, like those of a doe (female deer)

:
She looked at him with wide, doe-eyed innocence.
The child had a sweet, doe-eyed expression.