Idea of Sad Icon
This is a picture of a face that is frowning. It looks very sad. It doesn't have nose, just two small black eyes and a frown. It is a simple circle, not really a person who you could recognize.
This Sad icon is made in Material Design style
developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 6,200 icons, all in the same style and quality.