Despite its minimalistic design, Paper's tools allow for quite a complex range of blending and shading on the page. One of our community members, Bas van den Broek, has created an excellent series of "cheat sheets" that reveal a fascinating look into his exploration of Paper. Bas has collected these "cheat sheets" into a Creative Commons-licensed PDF available for download on his website, where you can also see more of his work. We're grateful to Bas for his contribution to the community resources.
If you are using Paper 53 Apps,please download/read this notes.It has helped me a lot to sketch better..