@ KOLARI: I like the moody atmosphere it has now. But as TermInator said, it's probably a bit hard to see other players.
What about trying some lighter textures on the buildings? It could help in readability and drawing player's attention. Or even better, use lighting to improve player guidance (thinking building exterior lights, fire, beacons, interior lights illuminating outside through windows, ... ).
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Perhaps a bit cliché, but a lighthouse on top of that mountain would be cool too:
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