Press C to clear your art Press D to delete the render Press E to toggle the "Eraser Activated" variable. 0 = draw, and 1 = erase. Press S to change the render style And finally, press 'space' to render your masterpiece!
Your art will delete itself after you render it, but you can render as many things as you want without deleting it. If you want to make art with multiple colours, you will have to render each individual colour separately e.g. drawing a face in blue, rendering it, then drawing the hair in red, then rendering it. The colour picker at the bottom left corner shows you what colour your art will render as.