So we select any color we want by tapping it. the three white circles are the size, press the eraser to erase all, but if you don't want, press E to enable erase (and press D to draw or also press on a color)
I have a huge interest in art. I even use old notebooks to be my drawing notebooks. Mi primo Ezekiel (aRandomNezukoFan) helped me in doing this, because I can't code that well.