For this manicure i used Zoya "Trixie" ( metallic base) and Zoya "Hyaden" (pink finish) .
First i covered nail with base color and then created gradient with pink transparent polish:
-Paint about 1/2 of nail with one thin layer of pink
- Add intensity with additional layers of pink on about 1/4 of the nail.
Metallic look really helps colors to look smoothly blended in each other. And the best thing is that this work really really great with almost all Zoya polish that i have, since they all are very transparent. Some design on the top also helps to smother gradation look.