Looking good. My only gripe is how small that dock is. How would a ship get in and out to unload containers when the bay is so small? I'd widen it and add some more significant features.
i would use real GeoData to start of with your map or at least a non-flat terrain of GeoControl or similar programms though read geodata would be cool.
also copy a water.con and a sky.con from an existing map and tweak them, that way you will get a more realistic water and sky
also dont upload .png it definitly worth it to convert them to jpg since it takes only 1/3 of the time to load em
Looking nice, but I think it would look better if you had either a normal car parking lot, truck parking, or both, but somehow separated. Those open containers laying on ground look really out of place.
Didnt' know you were an experienced(and if you are not, even better job! ) mapper grober, looking good so far. Looking forward to both the polish faction and the map.