Gradient monochrome nail art picture 2015 style

Quick answer：

Gradient monochrome nail art refers to a design technique where the color changes gradually from one shade to another on the nails. The term '2015 style' indicates that this particular design was popular or in vogue during the year 2015. It typically involves using a single color and applying it in a way that creates a smooth transition of color intensity, often using multiple layers of nail polish to achieve the desired effect.