Well when scientists wish to learn something, they use the scientific method. The first step is to observe something/could be a problem. Then ask a question about it. Form a hypothesis, or a possible answer to that question. These are the first steps.
Further steps include setting up an experiment and results, etc, but I think you know the rest! Hope this helps!
Certain characteristic elements of Renaissance painting evolved a great deal during the period. These include perspective, both in terms of how it was achieved and the effect to which it was applied, and realism, particularly in the depiction of humanity, either as symbolic, portrait or narrative element.
