He's eating the dog's dinner. Chocolate digestives and the dog wants some. The dog's got great expectations. The boy is called Buster, or maybe Michael, and his mum doesn't know he's in there. She said he could have one biscuit but he's eating out of the tin. The tin's been half-inched. He's pinched it.
The picture looks like America in the 50s - you can tell by the lino and the lace-up shoes. He's wearing dungarees, not jeans, and a proper shirt with cuffs. They didn't have rationing in America in the 50s, did they? We had rationing in the early 50s. The dog could be a she. She's called Bonnie.
The drink is strange. It's full - it's too full. You wouldn't fill it like that for a child. He's old enough to pour a drink. He's testing his sensory memory!
It's a hot day and the biscuits are sticky. If you look at his fingers they're covered in something like jam or treacle or chocolate.
The date's actually 1936. It says so beside the picture.
Someone's discovered the boy and taken a photo. There's someone behind the dog. Or maybe he's done a deal with the dog that it gets a biscuit if it doesn't bark. The dog's smiling. If the biscuit tin gets up-ended the dog will eat them all.