Usage tip:
It is very easy to use your images in Drawing Machine. You can move or copy your image file from wherever it is to the saved_images directory in the installed game. Of course, you can get your own images from a web search or by using your cellphone to take a picture. It is very easy to find the saved_images directory. Open Steam (i.e. that little icon which you click to get to the store). Go to your Library. Right mouse click on the Drawing Machine application to get the drop down selection mini-window. Choose Properties. Click "browse local files". A Windows file explorer window will pop up showing the game directory. The directory saved_images is listed there. Drag your images to that directory then you can open them in Drawing Machine. Incidentally, you can look in that file explorer window and see the exact address of the directory (i.e. the full path name) in case that would be useful to you.
As a suggestion, once you get that file explorer window open that shows the saved_images directory right click on it and choose "Create shortcut". A shortcut will appear in that same file explorer window. Drag that shortcut out to your Desktop. Now, whenever you want to add an image to use in Drawing Machine just drag and drop that image into the shortcut in your Desktop. That way, you don't have to remember everything I just told you. You've already done the work. You just have to remember that when you want to use an image in Drawing Machine you just have to drop it in that shortcut on your Desktop.