As we did on step 5, erase again the black area to reveal the nice colors. Remember to use different brush's sizes. Also you can select different values of Opacity of your brush (by changing its % on the option toolbar located on the upper part of the screen). If you made a mistake erasing a section you didn't want to, just press "Ctrl + Z" to go back. Press "Ctrl + Alt + Z" to go several steps back.