In the video posted below you can watch how Konstantin Fedoseev painted Denis Cyplenkov, step by step. I really can’t say it seems easy to do it. 🙂

https://www.youtube.com/watch?v=UQusgZ6ZPnU
Рисунок Портрета Денис Цыпленков (Speedpaint) Painting Portrait Of Denis Cyplenkov
Source: Константин Федосеев