What is Muro? Right, it is a simple but effective Drawing-Program for those who didn´t have the Time to draw Comics, Manga, Flowers, People or other drawable things outsite it. For example in Corel Painter.
You can draw with Brushes, erase it or fill a Selection/the whole Paper. And this as good and es real as you can draw it in expensive Drawing-Programs.
You can adjust the Brushes, Pencils or Pens in 3 Adjustings like Size, Opacity, Softness, Strokes and many more. It depends whethter brush or pencil you have. If you have money you can buy Points for so many kinds of Brushes as you want.
With a bunch of Filters and Effects like Motion Blur, Gaussian Blur, Sharpening, Finding Edges, Glowing, Shadow, Adding Noise, Inverting and Posterizing of Colors and something more your Creativity has almost no limit.
Just use it and you will know that you don´t need to pay Fine for Drawing on the PC except the Costs for your Internet.