The language features are effective as they are descriptions which give readers and image in there mind to imagine the situation. To answer the questions write down what image they would create in your mind, or what the sentence is telling you. Hope this will help you.
1-4 look correct to me.
for #5, you are correct that to come is not a prepositional phrase because there is no object. If I were you, I'd leave it alone and keep the one next it. all others look correct.
