I used photoshop mainly for the layers and masks. SuperimposeX is an amazing mobile replacement for that. You can basically do anything with up to 28 layers. I think this tool is way better than Lightroom, PS Express or YouCam, because of the multiple layers feature. The selection tools are more than enough, although not as intuitive as in Lightroom. Other functions in the app are great too. You can basically make your own stamps/stickers/effects without limit, or just import them from a picture. Only thing it doesn’t do is animation as far as I know.