Avercamp was a Dutch painter famous for his winter landscapes. He excelled at a technique called aerial perspective, which creates depth. He painted objects in the foreground in rich colors and objects in the distance in lighter colors to create a sense of perspective. Another feature of this painting is that the horizon line is drawn high. There are many different people in this painting. People playing field hockey? People playing something like hockey.
And a dog and a crow eating the meat of a cow that seems to have frozen to death, firmly showing not only the joys of winter but also its harshness.
You may want to look around to see where these people are in the painting.