This is a hard one to answer. The reason is that you are asked to distinguish between 2 schools of thought that are very close together. Not only that, but the characteristic you are looking for is not mentioned in either description.
Since semiotics brings in many more fields of study than does iconography, then I would go with iconography. This school of thought seems content just to find the symbols according to its description. What is done with them is mentioned in the other school but is not elaborated upon.
My answer would be iconography.
Answer:The Creation of Adam (Italian: Creazione di Adamo) is a fresco painting by Italian artist Michelangelo, which forms part of the Sistine Chapel's ceiling, painted c. 1508–1512. It illustrates the Biblical creation narrative from the Book of Genesis in which God gives life to Adam, the first man.
Explanation:
Some elements are line shape value , color, proportion/ texture/ shading.
Blurring and adds depth to flat designs