Artist's Eye app users are suggesting new features time to time. One feature requested by many was ability to skew image for perspective correction in case phone/tablet is not in right angle towards paper.
Version 1.9 released today finally have this ability. Here is list of all changes:
Skew for perspective fix when camera is not in right angle.
Posterize and Flatten palette filters.
On screen Menu button was added (as some new Android devices don't have menu button).