There are a few different painting applications on the iPhone that support layers, but none of them do quite so gorgeous of a job at displaying and managing them then Layers.  Simply click the layers button at the bottom left of the app and you get a quick animated transition to a 3D view where each layer is shown as a semi-transparent plane.  Click a layer to make it the active layer you’re painting on, drag layers to rearrange them and double tap to get back to painting.

You May Also Like

Early thoughts on iPadOS

This is a major quality-of-life improvement across the board for the iPad.