The artist primarily used to show depth and create emphasis in this painting

I would say lines, because the lines in the sky (the orange curved ones) create emphasis, and the white lines in the sky give the appearance of the road moving downwards.

Perspective

Explanation: I had it on PLATO

your question isn't complete

1492

columbus changes the shape of the world

ferdinand and isabella unite and create catholic spain

jews and moslems driven out of spain

lorenzo de medici dies

no one buying art and supporting city like before, his brother had been assassinated slightly before

florence to rome renaissance shift

east to west transition of church administration to the vatican