Deay Serif,
you really did a great job and made my dream app. Just 2 more options and i really don't need to leave my ipad and the app for any reason except take a rest: i wish you can put perspective guide for drawing correct perspective with all kind ( 1,2,3 and curvilinear). The second option is drawing guides (lines, ellipse, lazy brush).
the 2 options are great in an app called infinite painter. That's why i always have to go there for this kind of drawing tasks. So if you can put those 2 options in affinity photo for ipad pro it will be the real complete package for any concept artist.
thank you :)