Here's London, from my list of top 10 Zoyas:
this picture, it looks darker and more like the bottle. It's fairly opaque after one coat, I thought, but if you want it to be closer to the bottle color, you may want two coats. All Lacquered Up calls it the color of a pencil lead, which I guess is pretty close. As with all the Zoya Pixie Dusts, it looks awesome without top coat and usually awesome in a different way with it. I don't know that I remember trying tried London this way (though I know I have with others) - but here are PolishAholic's pictures, which include shots with top coat. Generally top coat added to the Pixie Dusts picks up hidden shimmer and looks awesome, though.
I did show a picture of London back in November - that's the link at the top - but I didn't say anything too much about it and I'm not happy with that picture, either. (Generally, I seem to end up much more satisfied with the posts where I go one polish at a time, I've noticed.)
(Incidentally, just because this is #1 on the wheel doesn't mean it's my #1 favorite Zoya. I just had them in sort of color order on the wheel. I didn't force myself to decide on a single favorite.)