yea animation is one of those things you need to be in a zone to do... cant just say oh ill just make a few frames and do some later. I find it so hard to get back into animation. I find it easier and more conducive to my schedule to do animations for games where its very shopping list-like.
I am trying to slowly get back into animations tho.
MistyE
Usually when I have free time and if I feel like it. I do what you do on some occasions and do it all in one go. When I publish it to Newgrounds, sometimes I regret how I animated a certain part since I could have animated it much better.
I try not to do that anymore so that the quality of my work doesn't suffer.
Ockeroid
There's always gonna be some stuff you're not happy with.
So a lot of the time I just try to remind my self that having something out that isn't quite as good as I wanted but is complete, is better than something that's exactly how I wanted but not finished