These are really quite nice. The b/w conversion is very good, especially in the second photo, given the contrast of the white pillars with the dark background. The perspective in the ferris wheel shot is quite breathtaking, although I think it could benefit from heightened contrast. I've taken the liberty of performing a slight lens correction on the second shot because the columns seem to recede into the skyline due to the wide angle of your shot. As you can see, there's still a bit of tilt in the building on the far left, but I didn't catch that before I uploaded it, so we'll just have to deal with it. Short of using a tilt-shift lens (which runs quite a pretty penny), there's nothing you can really do about this sort of distortion when using a wide perspective and looking up, so it's good to have PS handy.