man,
why are you not using the forum atachments?
I suggest you use
TMS for uploading your maps... it's really annoying to have to open another window/tab and look for the download.
About the map... plz dont do so thin polys for people to walk on. You should use only 2 big polys on you bridge, making a solid land, and not 4 to make 2 thin little bridges.
Your shading could be stronger, like the darker parts could be darker and etc...