SmileBASIC offers a very simple graphics sheet editing tool through the SmileTool. You can access the SmileTool by going into EDIT/DIRECT mode and then pressing the SMILE button on the touch screen. After opening the SmileTool, you can press the button that says "Paint" on the top-right corner of the touchscreen. Now you should be on the Paint tool.
The Paint tool is very self-explanatory. You can scroll with the D-Pad or Circle Pad, select or edit colors on the right, paint on the touchscreen, etc. You can save your work with the SAVE button on the bottom-right corner of the touchscreen.
Experiment with the tool and you'll be sure to master it!