An Android app

[lvreclp]

Hello All.
Firstly, I would like to introduce myself. My name is Oleg and I kind a like photography. SO I decided to create a small application, that will provide some features, that lacks on 500px.com.
After some thinking, I implemented photo filtering based on, camera brand, iso. In future I would like to implement also focal length, lenses and maybe something else.You can find my app on google play searching for "Filteryze".
So my question is, what features lacks on 500px? What would you like to see in app kind if this?