But wait... while Umbra actually is a gifted watercolor artist, these were done in record speed with the help of an iPad app called Waterlogue! It is amazing.
You may say it's cheating. But art is art. You may say this art is done in collaboration with the programmers of the app. The computer wouldn't have a clue how to do it alone. And there are still many decisions involved in the process by the artist.
Also, if a computer can do it, why involve a human? And if a human can do it better, great.