Yeah, I decidied to inform everybody about what I recently resolved to do.
So, this is the code of proceeding when dealing with comments and/or favourites on my Deviations.

1. When somebody random gives me a favourite (or more of them in a row)
- I thank on their lookup and try to find a Deviation among their Gallery I could comment. If I find it, I leave a thoughtful comment (not always a complimentary one)
- If the person doesn't have any Deviations in their profile, I don't leave a thank you note. I assume that Favourite-only lookups aren't quite the thing I want to promote on DeviantART
2. When somebody random gives me a comment
- I reply to the comment with a thank you note
- If the comment is in any way thoughtful, I respond to its matter.
- If the comment is about why the universe of the FanArt is incorrect (like, "ninjas in oranje jumpsuits are stupid" under my Naruto fanart) will be hidden
3. When somebody I know gives me a favourite
- I cry and think why there wasn't any comment
4. When somebody I know gives me a comment
- I'm happy and will respond to it
5. When ANYBODY gives me a favourite AND a comment
- I'm a happy kitty and will luv them fureva
- And will act like in every point from above they fulfill

Enjoy xD