That was done with China Glaze Awaken and China Glaze Agent Lavender, using konad plate M70. It doesn't look completely terrible, but if I'd known then what I know now, I would have reversed the colors and used Awaken for the image. Agent Lavender simply isn't opaque enough to work for this look.
Some polishes just work better than others for images. The edges are more crisp and the design more professional looking.
Sometimes, though, what you want is a more subtle, less opaque design, as I did with this look (click for larger image):
That's Misa A Sin Worth Committing with China Glaze Secret Periwinkle, using plate M63. While generally I wouldn't use Secret Periwinkle for a design, in this case I think it worked. I didn't want to distract from the beauty of the Misa polish, but I had the konad urge, and when that urge hits there's really no denying it.
I had toyed with the idea of using a different polish for the design - as usual, one of the ones from the China Glaze Romantique collection. I even went so far as to swatch it before doing a full manicure:
Zoya Dierdre, China Glaze Joy, Konad M70
Misa A Sin Worth Committing, China Glaze Awaken, Konad M63
Misa ASWC, China Glaze Secret Periwinkle, Konad M63
As you can see, the image comes out much better with China Glaze Awaken than with Secret Periwinkle. However, with Secret Periwinkle you pay more attention to how pretty the base color is, and that's what I had wanted that day.
Sasse has put together a lovely list of polishes that work well with image plates. For the most part, though, I just enjoy playing around with what I already have. I'll try it on a finger or two before removing my previous mani, and if I like it I'll try it. Worst comes to worst I'll wind up not liking it and I'll have an excuse to change my mani again. ;0)