I found this video review of the newly released iPad app, Pixelmator Photo. The reviewer has done a good job going through the features so I thought you could watch this instead of having me do a review. His way of going through the functionality almost makes it a quick tutorial of Pixelmator Photo for iPad.
Since I bought the app yesterday my experience using it is limited, but what I have seen I liked a lot. The machine learning editing works pretty well.
For the 5 USD the app cost, I think you get a good and easy to use photo editing app. Snapseed is a free alternative that I recommend if you feel Pixelmator is too expensive.