If this app had two additional capabilities, it would make it worth my time and money to use it.
First - what it does: it walks the user through 3 steps to modify an image. First you pick an image or take a new one, then adjust its zoom and panned position. Second you pick an interesting mask that frames your image. Third you make image adjustments like Hue, Brightness, Prebuilt filters, rotation, etc.. this last step affects the entire image, including the mask. For example, if a prebuilt filter makes your image bluish, the bluish color also gets applied to the white mask that frames your image.
Where it could improve: three suggestions here - first, allow the user to adjust the zoom and pan of the image AFTER picking the mask/frame. Two, the adjustments on the final stage should offer a toggle to either apply them to the whole image or just the image behind the mask/frame. Three, allow the user to import their own masks - perhaps even providing suggested masks from a website.
Overall decent app, but there are some more versatile/advanced apps, like OVER, that can do the same thing as this app, provided the user has an understanding of layers and basic graphic development. Some people need a solid workflow, which is where apps like this do better than the more versatile apps.