"Art should make us feel more clearly and more intelligently. It should give us coherent sensations which we might otherwise not have had"
Robert Hughes

Just practice. i used to practice whenever i could when i was younger because i loved it but i wasn’t the best at it. watch videos if you can, and any other tutorials.

The linear perspective changed the quality of art because it gave art a sense of reality. it gave the illusion that the background and surroundings were actually close and/or far and a sense of depth. linear perspective change the quality of art following its birth the renaissance period as they want the art to be more realistic and they believe one way to achieve it is to use the method of linear perspective. it uses the principle of math to realistically portray space and depth in art. 

Amusical im pretty sure

Because most artists loved the way that their men or women that they were to paint/sculpture just the way that they had when they sat and posed and they thought that it looked more i guess