This passage is from The Children's Bach by Helen Garner
On his way through the kitchen he screwed up the pizza boxes and tried to force them into the stuffed bin, but they would not go so he left them standing in the corner. He shuffled the newspapers into a pile and his fingers slid across the cold surface of a photo. He picked it up and looked at it with dull eyes. Green. The boy, the young man was smiling in the garden, and the father was walking away. ‘The blushing apricot, and woolly peach,’ said Dexter, ‘Hang on thy walls, that every child may reach.’
First of all, is "the father was walking away" metaphorical? Does it mean "He was at the edge of the frame?" Some pages earlier, when Vicki sees the photo, it is written:
The older man, Vicki saw, stood side-on, as if about to slip out of frame.
In the phrase "The blushing apricot, and woolly peach," does "The blushing apricot" refer to Dexter himself, and "woolly peach" refer to his father?
Does "Hang on thy walls, that every child may reach" mean you should protect your photos and everything that belongs to you, otherwise every child may take it?
Or that you should not allow everybody see your photo?
Does "walls" here refer to photos? Or does it refer to your privacy?