Cartography Tip
Keep a list of icons to add to empty spaces on a map. Things like dead trees, mills, burnt houses, etc.  I even write things like "trails", "rocks", "groves", and more simply because when faced with the blank space of a map, sometimes my mind goes right along with it.

For inspiration on icons, whenever viewing maps or even landscape photography, note what stands out to you or unique things you want to incorporate into your own pieces.