I the common progress of creating digital art a clone brush is a very often used tool.
Current Workflow in Sketchbook:
When you go into details you often have to blend multiple layers or reusing textures or forms you've already created in you're image. Currently you could use the selection tool, to mark that part, copy paste it as a new layer and use a soft eraser to blend it. This is workflow works, but it is time consuming not state of the art. Especially if it comes to some kind of matte painting.
The solution is a clone like it is availabe in many other commerial and non-commercial painting tools.
My own personal opinion: Yes you can live without a clone brush, but why should you? It makes digital artists' live so much easier. And by the way this not a very complex function to implement, so I'm looking forward to see a clone brush function in a Sketchbook upgrade!
