Nice Alistair, also nice to see that you took some of my suggestions...I liked the image already, but now it even looks better!
and yes, it looks very futuristic, and like RBrice said, it looksl ike it was ALL created in PS...so nice work Alistair
I've discovered the "sore thumb" reason. I think that was your daytime picture, am I right? When it's blown up, you can see some of the reflections of clouds. All you'd need to do is work on that a bit. Otherwise (and even as is) it's good.
Reminds me a lot of Vegas in a way - with the Monorail there. Nice work. These are real pictures? They look very photoshop created (of course you know that's not a bad thing).