Bi-Weekly Challenge! - Industrial Windows

My take on the challenge.

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Final! - Added white mineral deposits (that's what I think they are in the reference: http://www.textures.com/system/gallery/photos/Windows/Industrial/15601/hotlink-ok/WindowsIndustrial0068_shared.jpg)

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Final!

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Final!

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Final!

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6th Iteration - Started refining the colours.

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5th iteration. Near where i want it to be, I balanced the wear and masking a bit.

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4th Iteration. Added cracked glass and wire mesh.

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3rd Iteration - Started wear and tear.

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2nd Iteration

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1st Iteration