To create my illustrations I use my IPAD and an app which is called Procreate. It is my favorite application to use as it gives you a variety of brushes and textures which you can later use in your drawing.
Below I have attached a timelapse video of me creating the illustrations.
Also for the little snippet video, I wanted to give some raw film aesthetic, from the video attached it was easy to guess the video was shot on the iPhone and edited on it as well. I have used 2 programs: InShot (For cutting up and mixing up the shots) and Prequel for editing the video effect.