keep it simple: like it is! wild fun
Yes, I agree ! Only a function "save to Dropbox" could be nice.
I am with you, keep it simple as much as possible. There are complex drawing tools available enough. They all need much time to select everything before being able to start practicing. Being simple helps reducing to the basics which is mostly good enough or even better than using lot of technologies.
Daniel Lopez commented
I agree! There are just a few things I need, like the zoom and the ability to turn the crosshatching on or off. The app feels as natural as grabbing a pencil and a piece of paper, that's what I love about it.
Love it! Don't make it too complicated - add just a few of the most necessary features, not extra brushes, sizes, etc. Just one more layer, smart eraser, and be able to return to earlier sketches to complete them.