I did this digital drawing with MS Paint, the earliest and most basic form that has been there for many decades. Even here I used the paintbrush, pencil and a few other tools in much the same way that an artist uses when painting normally on canvas. I didn't use any of the special distorting tools. I just applied the paint as an artist would with no special effects and it came out like this...One drawback is it takes a lot of time and is not easy as it looks, but it is very enjoyable.