If you really like drawing this is a good chance to get your hands on a good program for this purpose, like GrafX2. It's a simple graphic editor that has everything you need to generate this kind of drawing.
Really simple image editor
The program accepts different file formats like PNG, GIF and BMP, and it has all kinds of tools, like lines, circles, polygonal shapes, brushes, airbrushes... It has a unique yet rather easy-to-understand interface. It combines the detailed and general view by means of the zoom to manage the maximum level of precision.
GrafX2 has been developed based on two old Amiga programs, Deluxe Paint and Brilliance, as a model to be followed. Work with 256 colors using the RGB and HSL system, enough to generate pixel art drawings and video game graphics.
You'll only have to use your imagination to draw all kinds of figures when you download GrafX2 for free, a complete solution if you're looking for a functional drawing tool that's free of charge.