Personally I like the look of this. While I can certainly appreciate the opinions of Ferret and CJ that the themes perhaps don't compliment each other, I feel you have tried something remarkably different and pulled it off nicely. I second Tracer's comment that the second shot is the least impressive here - reliance on textures rather than architecture on the Greek theme in this area, next to the interesting brushwork of the "future" part, makes it look odd and clashing, while for the other areas you seem to have integrated the two themes much better.
My main criticism here isn't to your map at all, but to you posting style - I suggest less screenshots in the future, as we do have quite a lot of modem users, and many of the ones you have posted are just different angles of the same room. I sympathise as it can be hard to pick between angles at times, but its really not necessary to have quite so many - you aren't trying to show us ALL the map, just its most impressive views, to sell us it if you will.
Anyway, welcome to the snarkpit mate, the three maps you have posted this evening all look really interesting and I'm sure you'll be able to help out others around here as much as we will hopefully be able to help you 
[addsig]