By using a classical Greek balancing technique
By using a balancing technique developed by an ancient Greek sculptor.
by using famous greek philosophers as subject
By reviving a classical Roman-style dome
It was successful because of the great amount of funding by the nobles and governments. If it where not for the ideas of humanism, then their might not have bin a renaissance.
after Black Death people rebelled a lot. Humanism appealed them to maintain order.
humanism in renaissance times is when the artist painted human acheivments or human potential into their artwork. The Arnolfini Wedding represents this because Jan Van Eyck painted himself into his own painting, in the reflection in the mirror. Also, how he signed his name so big and visibly on the wall, which also might hint that it was the legal document of the marriage. But that topic still has much debate.
the renaissance era showed that man is basically awesome contrary to what Catholicism taught during the medieval period. This era was the transition between the middle ages, and the modern era.
Humanism is a concern and focus on human beings. Both the religious and the non-religious can care about others. But with a religious humanism, including a Christian humanism, the concern will first be with the god and obey the religion's rules and perhaps converting people to the religion. Then after all that, you might worry about the person starving to death. With a secular humanism your first concern is with the person starving. A religion will always put the god first, then people, even if the religion does care about the well being of other people. A secular humanism goes directly to caring about the person.
The idea of humanism challenged the established belief in Europe because it presented the notion that comfort and kindness in the here and might be preferable to an ambiguous reward in the afterlife.
Since Donatello was a sculptor we have not seen what color he might have preferred.
Restore it to its original condition .
The "lowered" status of the gods "raised" the relative status of humans.