From Longman Dictionary of Contemporary Englishpretty as a picturepretty as a pictureBEAUTIFUL/GOOD-LOOKING old-fashioned very pretty → pretty
Examples from the Corpus
pretty as a picture• Property: Not quite as pretty as a picture A house committed to canvas is a house that's easy to sell.• Francesca was as pretty as a picture and apparently glowing with health.• Rachel looked as pretty as a picture, her lovely body warmly covered by a grey riding cloak lined with miniver fur.• She looked surprised, and threw up her hands, pretty as a picture, then began to set the chessmen afresh. 