Mednyánszky's works were largely in the Impressionist tradition, with influences from Symbolism and Art Nouveau. His works depict landscape scenes of nature, the weather and everyday, poor people such as peasants and workmen. The region of his birth, north-eastern part of the Kingdom of Hungary), part of Austria-Hungary was the site and subject of many of his paintings; scenes from the Carpathian Mountains and the Hungarian Plains are numerous. He also painted portraits of his friends and family, and images of soldiers during the First World War whilst working as a war correspondent.