Gradual nail design picture album full of pictures, 2015 models picture appreciation

Quick answer：

Gradual nail designs refer to nail art styles that gradually transition from one color or design to another. These designs were popular in 2015 and can be appreciated for their creative color blends and patterns. They often feature a smooth blend between different shades, creating a unique and eye-catching look. To view a collection of such designs, you can search for 'gradual nail design picture album full of pictures 2015 models picture appreciation' online, where you will find numerous examples and inspiration for this nail art style.