Some people learn by example. So I'm posting a link at the end of this post. When you watch this video look at how the main guy (Brian Wilson) doesn't accept anything but what he has envisioned in his mind.
When you know what you want to create, you don't settle for any variations. Don't go for accidents that look ok and then take credit for them. Painters: make every color because YOU mixed for it. For drawers: make every line deliberately. Same with animation. Don't accept an anomaly in your animation and say, "Well I was going for sneak walk cycle, but this looks like a double bounce.. sooo I'm going to do a double bounce now."
You learn nothing like that. Spontaneity is good sometimes, but do not rely on it. Learn how to control details.. The purpose of learning details is so your work not only looks good the first time around but also when people take their time and stop to check out your work. You don't want it to look nice from afar and then when they come close to see it actually looks like shit... In high school that is one thing I worked really hard on, details. It teaches you patience and trains you eye and hand. Here is an example, the following picture I drew back in the summer of my sophomore year in high school. It was for my brother.
In the close up, you can still see my pencil marks, my goal was to make it so perfect you couldn't tell it was done in pencil. I was close, but the point was that I was trying to control my level of detail and not just let random lines make up my drawing in a span of ten minutes.. TAKE YOUR TIME! There is no rush. You'll be so surprised in how much you can learn when you spend two hours on something..
Here's a link I promised earlier. when you listen to it, again, just listen to the directors specific choices. he knows what he want's before he starts. And once you have that kind of mind set, your work might be tremendously complex, but it'll be under control because you know every detail and how you want each one to turn out. So check out this video. It's a real treat to see this genius at work. Brian Wilson is one of the greatest song composers of all time. So take your time and listen to all of it. And then go put as much dedication into your own work.
super awesome video