The most important thing that happened in the renaissance era was the sudden concern with color texture time perspective reality

I think it's perspective. They wanted to show more detail

Is there a question?

This sounds like a personal reflection on something you did. it is asking the hardest part, or a part you may have struggled with on an informal interview you must have done. it is also asking advice you'd give someone else for the process of completing an informal interview, so you should write something that would . for example, maybe the first thing they should do, something they should include.