Doesn't look too bad, but most of the textures still look like the reguler stock assest that come with the UDK.
Here's something that I created a while ago: http://forums.epicgames.com/threads/974302-Halo-CE-Derelict-remake-in-UDK
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That's odd haha, I didn't use any of UDK's stock assets. Great job on that Derelict remake! It looks really good!