Textures need changing for sure. If this is your first attempt at a map I hope you're reading some tutorials.
I'll give you some constructive criticism (not to be taken badly, to help):
Most of the textures you're using are HL2 textures, now whilst this does create the "dark" or "gritty" feel of RuptureFarms, it doesn't blend in well with TF2. It's fine for now but you also have to think about how it would feel in gameplay terms.
I would recommend either the just as gritty industrial TF2 textures or custom textures to suit the map more. Lower lighting would work wonders for something like this. Otherwise, improve some brushwork and it is getting there.
+nice concept
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FrankerZ
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