Hardest Riddle

Question: My first is third, like the sound of the sea. My second is the center of you, not me. My third is the end of him, not you. My fourth starts a picture, not a view. My fifth is in bean, though not in been, My sixth and seventh start seldom seen. Sunrise and sunset, warmth and cold, Put these together and a sign will unfold.

Question: What tastes better than it smells?

Question: What goes in the water black and comes out red?

Question: People see through me, but none pass through without killing me. I can be anywhere, and can be seen double or single. What am I?

Question: What asks but never answers?

Question: I have 6 faces and 21 eyes, but can't see a thing. What am I?