Not quite related to the metal, but the mesh seems to have a discontinuity angle of 0 which is causing every face to stand out on its own, and the normals don't quite seem to be working right as well.
i think your trying to link files that aren't in your dropbox public folder, if i manually enter the urls i get the dropbox 403 error and it asks me to login.
im assuming you can see it fine since your are already logged into dropbox and the files are only viewable from your account.
still not showing. To publically share images they MUST MUST MUST be in or in a subfolder of "my dropbox/public/" if you're running the shell extension (default dropbox install) you should be able to right click the file and select "dropbox-> copy public link"
If that option is not there under the dropbox portion of the rightclick menu, then the file is not publically viewable.
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[TAG]http://img27.imageshack.us/img27/3152/mechleg.jpg[/TAG]
One of your links was a facebook link and won't work
And your dropbox link point to your account url's. You should use the public link instead.
http://wiki.polycount.com/SpecularColorMap?highlight=%28%5CbCategorySpecularMap%5Cb%29
Not quite related to the metal, but the mesh seems to have a discontinuity angle of 0 which is causing every face to stand out on its own, and the normals don't quite seem to be working right as well.
http://cg.tutsplus.com/tutorials/photoshop/how-to-hand-paint-convincing-metal-textures/
but ya you should pull out the noise and scratches from the normal map, and work on you specular and gloss.
check out this tut http://www.philipk.net/tutorials/materials/metalmatte/metalmatte.html
i found all of Philip's tuts to be very useful when i started to learn how to get good material definition in my textures.
but i guess the others can see it
im assuming you can see it fine since your are already logged into dropbox and the files are only viewable from your account.
If that option is not there under the dropbox portion of the rightclick menu, then the file is not publically viewable.