Retrica is best option as a photo effect or photo editor. I have taken very good shots from this Retrica App. There are lots of effect from which you can capture best shot but it is special for human photo. Best for selfie photos.
Cons:
1) It is best to give effect for photo as well as for videos.
2) Collage is available in different frames.
3) Effects are real.
4) Lots of stickers which look very beautifull.
Pros :
1) Take some time to capture photo as compare to normal camera.
2) It is not good for taking photos of lake, rainbow, sunrise it doesn't look good.
Over all nice app for selfies. 3 out of 5 star for this aap.
