Breugel's Hunters in the Snow depicts an ideal medieval town site for several reasons:
Trees provide wood that is used for building, making fires and weapons.
A town needs to be located near good hunting ground so that hunters can find meat. This is especially important in the winter.
It was useful to have all or part of a town built on high ground so that attackers or raiders can be spotted easily.
Rocks provide stone that is used for building homes and for making weapons.
Space is needed within a town for growing crops. This enables the people to have a varied diet. In this picture, the fields have flooded and frozen and the people are skating on the ice.