as pretty as a picture

US /æz ˈprɪt.i æz ə ˈpɪk.tʃər/
UK /æz ˈprɪt.i æz ə ˈpɪk.tʃər/
"as pretty as a picture" picture
1.

very attractive or beautiful

:
The little girl looked as pretty as a picture in her new dress.
The garden was as pretty as a picture with all the flowers in bloom.