Happiness on dA is...

...when someone gives you a really sweet comment.

...when your favorite artist updates.

...when you find new cool friends.

...when you get a reply from someone you really admire.

...when you find someone who is as crazy about a fandom or OTP as you.

...when someone found your page because a 'recommendation'.

...when you stumble across a really cool random artist.

...when you get a llama! 8D

...when you can rant and be angry in a journal and people makes you feel better.

...when you get fantastical fanart. (thanks !
LikeYouWannaKnow)

...when someone starts watching you (thanks *
hae-ri & ~
Mojja)

...when you see art that you really like and get inspired by. (thanks ~
Nakamura02)
What is happiness on dA for you? 
I really like it when I get a fave or comment though. It means that someone has taken the time to view my work and either show they like it, or say what they think about it, or both.