I bought Scribbles a while ago too. @Anomaly112 This is a Vector Painting program which is not like Photoshop or Corel Painter which are primarily Raster programs. It’s more like Adobe Illustrator in that you can scale the lines as much as you want and they will retain their integrity. It’s simplicity and speed keeps one from getting bogged down in the interface. I do wish, however that there were a greater variety of brushes.
Of particular note, you can rotate, zoom, or move each separate layer very easily or use the grabber tool to select all layers and move them together -- talk about simplicity. No pull down menus here. Also, just in case you miss it, there is an opacity slider on the upper right side of the layer window which is handy for doing your under drawing.
Personally I use Scribbles when teaching children how to draw. The interface is very simple and the ease of creating layers makes it easy to color the layer below.
Make sure to look at the Keyboard Shortcuts in Help (which unfortunately has to be dismissed before you can continue drawing so you might want to make a Screen Grab of it and open it in Preview).
Wherever you go, there you are.
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