Gee, more than a month has gone by and I am so absorbed in all the photographic apps out there I have completely forgotten to post! Interestingly, my favourites still remain the ones I researched and started off with: Snapseed, iColorama and Superimpose. However, I miss the heavy duty selection tools in Photoshop and the layering so I am testing apps at the moment for their selection and layering abilities and these will probably supersede Superimpose. I do use other apps as well to add interesting effects like I did below using Trimaginator (web effect).
I love that you can now import brushes into iColorama (not that there isn't a fantastic choice) and I created this picture on my iPad from scratch using brushes I created from free vintage pictures and some textures from Jerry at Shadowhouse Creations.