How To Save Or Export Your Sketch
If you want to save your sketch as a template (so you can use or modify it later), click on File > Save. This will be saved as a .sw file which only opens within SketchWow.
If you want to save it as an image file instead, click on File > Export. You can export it as JPG, PNG, PDF, Animated GIF and SVG.
One more thing to mention... if you wish export only a part of your sketch simply click or highlight the selected elements > right click > and select Export Selection.