Autosave always uses the current filename, which is a disaster: the file is then saved in a state that you haven't chosen — probably many edits away from the file you want to retain. Microsoft Word, etc., do this best: you get regular files identified as "autosave", and you can continue working on the current file until you're at a point where you actually want to save it under the current name. 

Some of us work by saving regularly, with updated names:  Image1, Image2, Image3, etc. That way we can always revert to a certain precise point. And since you can't turn off autosave completely in this app, you're constantly getting a version that you don't want.

Not everyone will need this, and some will find it confusing; hence it should simply be an option.

I'm using Artstudio Pro on a desktop Mac.  When painting with a mouse, you'd assume that right-clicking would do at least something -- allow you to change the size of the brush, at the very least.  But it does zilch.  This seems a bit weird: to change the brush size, it would be a whole lot better to right-click than having to use the ] and [ keys. Or it would be useful to have right-click switch paint to eraser.  Or, better yet, it would be great to have it programmable.