I think the answer is a tripod.
Throughout the Renaissance, artists moved from depicting religious motifs to depicting humans in all their glory. You can see this in paintings and sculptures by people like Da Vinci and Michelangelo. Humans were put up front instead of the Church. Nothern Europe, however, was much more conservative than Italy, but they also started going towards liberation of people.
The process of receiving or giving systematic instruction, especially at a school or university.
A critique is honestly just your opinion on the work, also you didn’t put any pictures of the pieces of art so no one can actually answer this for you :/