Major: photoshop for ipad, fully functional.

Photographers must have dazzling effects: lens light, lens flare.

Fotolr photography studio

Iphoto of ilife suite (provided by apple)

snapseed

There are many more. Because ipad is a tablet computer, photo processing software is not as powerful as a computer, but it has universal functions. The landlord can install many other small P software to use. 360-degree panoramic shooting, sketch photos and so on.