You can only contour point data. The image file will only provide tracing capability. You can create an Area/polygon layer. Setup the desired layer attribute names and display above this image layer. Click the Edit Layer button and select the Include polygon tool button and trace the entire boundary. Then switch to the Split tool options (polygon to areas that do not touch the external boundary and line to create polygon areas that do share the outside boundary line) to trace the areas that will become the zone areas. Click Save and close
If you need step by step instructions, please let me know.