>>5857253That's one of my favorite anime intros. The music and the art are all wonderful.
>>5857267 is right, unfortunately. Many of these skilled animators are on the way out the door of this world, if they aren't already. In the west too, like Don Bleuth. That man could draw some gorgeously expressive women, but he hasn't done shit in I don't know how long.
https://youtu.be/-SSA1jLCr3IIf you want to make stuff similar to them, your best bet is of course to study anatomy as your base of learning, like muscles and how the light works when it shines on it from certain angles. Then you can pick your favorite artist, like Nobuteru Yuki and do a character study. Get some art books he made and look through them. Freeze-frame anime he worked on and study the anatomy, angles and lighting of the characters. Learn to replicate the things you enjoy the most about them.
Its really all observation and replication. Tearing apart every little thing they did and remaking it, more and more accurately, until it resembles them. Do this enough and eventually your work, with all the positive influence you pinched from here and there, will become something fully unique to you.
All the best Japanese artists of those days had influence from their art superiors, or even western animators from Disney. Go Nagai for example influenced a ton of people, like Kentaro Miura. Miura is wildly held in high esteem, but even he had to get his influence somewhere.