A new release of this app includes layers, and a whole bunch of new features. Check it out - this app really shines because it uses GPU acceleration and it's so snappy. I'm not affiliated with Silicon Benders, btw - just spamming here and the other Surface hangouts cause this is a really cool, overlooked app. It really bothers me that this program doesn't appear under the Digital Artist collection in the MS store for some SP3 users (like me, for example) meaning that it's not getting as much exposure as it should. You have to search for "Sketchable" to find it. The author says that he sees it in this collection using his SP3, but says that depending on locale, it might be hidden from certain users.