Really great app, but I do have a few suggestions...
- The language should be configurable--English/Espanol/etc. at least English. Its impossible to understand this language if you dont speak it.
-The face detection works great, but it would be much more useful if you could adjust the location of the effect. And also add more focal points as needed.
-My final suggestion is that you can use any picture size without having to crop it to a square. (So if I have a 1:3 size ratio, the full image can be used in the app.)
Other than these three suggestions, this app is spectacular, I would definitely recommend!