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Looks good man. Use more than just one texture overlay, try to get scale of the individual textures working to create depth in the image. You probably know this site already cause its awesome, but if you haven't tried cgtextures.com be prepared to loose your mind... Changed my life. keep it up man looking good.
Very cool! I like all the textures! Maybe just a bit more grouping of values and lights, I think that would help it out a bit, but I like your colors alot! Its a sweet perspective as well!