Congratulations for your awesome app. After having tested dozens of apps, this is really the only one that has EVERYTHING that I need for handwriting with my tablet.
Just one small request: Everytime the user has to change the drawing tool color or size, the pop-up menu unfolds on the middle of the working area, overlapping the ink. I suggest that it would be a nice idea to have an interface that could leave a bigger area clean of menus. I'm sending a small sketch of how it could more or less look like.
Perhaps it would be an even better idea to let the user choose among 3 or 4 different toolbar positions.
Anyway, thanks a lot!