E to erase. B to undo. C to clear. Press the number keys to set the pen size to that number. Ex: 4 sets pen size to 4. Click on the color that you want to use from the colors provided on the top and right sides. Press L to make a straight line from where your mouse was when you clicked to where your mouse was when you unclicked. H to turn off music, spacebar to turn it back on. M for a premade circle. (Just click where you want the circle to go.) N for black backdrop. V for white backdrop.
SeaTurtleCreate and I came up with this. :) It's gonna be great!