While desktop post-processing applications are 'all-in-one', mobile apps tend to be more task-specific. This means a different workflow when editing an image on the iPad. I just posted an article on
iPad image editing workflowon my blog with a step by step including cloning out an electrical socket, cropping, applying a filter, editing IPTC data, and the final export.
It's how I made

from beginning to end, including the various apps I used, how I used them, and why I chose them.
Hope some find it useful.

PhotoJazz 
Recent Blog Articles
Shooting Street at NightStreet Photography Tip: Stick With an Interesting SubjectAn Exercise in Composition (more general, less street)
5 Tips for Better Street PhotographyThere are also a few older articles that you might find useful, like my
Non-Guide to Street Photography