WOW! Those look fantastic! You my good sir have quite a talent. Take a look at the Profantasy site and it shows some of their image catalogs. Or you can do a search for icons on Google. Google the type of icon you are looking for or just reduce the size or type of image it should return. You are on the right track, pun intended. The way you are depicting the images is dead on. They convey more information than just names on a map. If this game is for all ages it works so much the better. As for children, the image of your mine stop conjures up the sound of that machine. Making connections like this is a great way to get emergent experiences from playing a game.