charon2112
King
When a farm is worked, it will turn green. When not worked, it will be brown.
When mines are worked, smoke comes out of the shaft and the cart moves. When not worked, there is no smoke.
When unimproved tiles are worked, a little lean-to appears in the tile. When not worked, the tile is empty.
If you don't see these things, your graphics must be on really low settings. That, or you're blind. Or your game is bugged. Point is, normally these things happen.
also, when a farm is worked, there's light inside the farmhouse and smoke coming out of the chimney.