1. what are impressionistic landscape photographs? how might someone achieve them?

I don't know if you still need the answer but here ya go!
An impressionistic landscape carries with it a vague or elusive sense of reality. So impressionistic photographs will make the landscape seem more unreal. you get the best photographs at the golden hour and theses pictures work really well at the beach. 

Answer(simplify painting);

Answerminuet;