What's the difference?
In Picture A, there are two windows. In Picture B, there is (only) a/one window.
What's the difference?
In Picture A, there are five flowers (in the vase). In picture B, there are three flowers (in the vase).
What's the difference?
In Picrture A, there is a glass of orange juice on the table. In Picture B, there is a glass of water/milk on the table.