I drew this using the shade tool of Paintology. It's quite a good brush to make realistic drawings such as this and anyone can do this with some patience. Hope you can give it a try!
Here is a drawing that I did while I was outside with my tablet and the humble Paintology app. It was the very first time, I though of doing a drawing in plein-air but it was definitely done. This one, took me under an hour. Hope you like it!