Copyright line for screenshots and artworks

[Khalni.3864]

Hey there, i recently started posting things on my Deviantart profile, and wanted to share some of my ingame screenshots and artworks.
Can somebody help me on what i need to say about Intellectual Property of ArenaNet and NCSoft?
My posts will generally fit 3 categories:
- Edited screenshots (no elements added or removed, just filters and small corrections)
- Artworks (no screenshots involved, everything created outside the game)
- Screenshot-based artowrks (characters/landscape cutouts from screenshots and graphic elements form outside the game).
I need to know if i need to ahve different lines for the categories or if one is enough, and also what should that/those lines contain.
Thanks to anyone willing to help 🙂