An acre of entirely corn is approximately 15 million calories, and a family of four needs minimum about 3 million calories a year, so I'd give about it about 6 months before you murder each other from every-meal-is-corn psychosis

The image is 950x940 px, and an acre is 209x208 feet, so overall scale about 4.5 pixels per foot. "Lawn" is 250x310px = 55x68 ft or 3800 square feet, although the actual lawn-looking space is larger and several parcels. The fruit tree orchard is about 40x60 feet, chickens 30x30. The big cow is 15 feet long, which seems kinda big. House, excluding garage, is 32x22, which seems like a small 1 bedroom apartment.

1 acre = 43,560 sq ft

If we assume the lawn is like 2/3rds of this plot then that's 14,520 sq ft of cropland, which is better than the estimate, but also a singular cow requires 1.5 to 2 Acres of Grazing Land. To have the cows, pretty much all of the crops would go directly to them.

Here’s the Mother Earth News article with more details