Answer:
maybe add the art
but here's a definition of all of those:
Foreground is the front of the art. The focal point or the thing that if right in the front. In terms of layers, it is the first layer. It has the most detail.
Middle ground is the middle layer of art. It is not front and center, but it is more of like the 2nd layer. In terms of layers, it is the 2nd layer. It has a moderate amount of detail.
Background is the last layer (in terms of layers, 3rd layer). It is the way back and doesnt have too much detail usually.
