I imagined something that might be nice, so I sketched it on a small canvas in photoshop and added it to my ideas folder. Later I imagined something different and drew a swamp.
I imaged during ancient Egypt with many different sizes of people from inbreeding. They said Atlas was a giant man, but Hercules they didn't give a size, but a Midget would look very strong if he was stronger then people imagined. So I made a Midget Hercules pushing the moon in a fantasy scene. I had to make it bigger a few times to get all the details I wanted. So the center was not redrawn, just the moon because light and dark started to mess up when enlarging the canvas.
This is what I saved while I was drawing, and decided to put it together to show how a person can start and create a digital drawing in Photoshop, or many other artist programs.
If looking at the PSD helps you learn how I draw then here is the download for this drawing in a zip file
[link] or directly to the psd
[link]
When you become quick you could draw lots of ideas that are so easy you feel free and happy to enjoy very creative moments.
So do your best to work with the program. Use everything it does better first, and then do everything that helps you draw better with less effort.