Happy (who's not always so happy)

I felt so sorry for Happy throughout the entirety of the play. He is constantly shoved into the background behind Biff not only in high school, but also when they are grown men. In high school, Biff was the star athlete, and Happy was just the younger brother who got to carry his gear. Biff was always in the limelight and his father's sight, where Happy had to constantly draw awareness to himself so his father would notice him. When the boys grew up, Willy was still concerned with Biff. Ever since Biff found out that Willy had been cheating on his mom, Willy had been trying to get his forgiveness and make up with his son. He wanted Biff to be successful, rich, and have a better life than he did. He wanted that life for Happy too, but he never expressed those feelings. At one point in the play, Happy announces that he's getting married, and no one even says congratulations or acknowledges it. Happy was always just Biff's younger brother.

Suspense

Dramatic suspense is present throughout the play. Just by looking at the title Death of a Salesman, I couldn't wait to find out who dies (or if someone even dies). Then, Willy's suicide attempts are hinted to when Linda informs Biff about Willy's accidents and how the insurance people said it wasn't an accident, but an intentional act. After this point in the play, Willy's mind is portrayed as more unstable which adds to the dramatic suspense to see if he is going to succeed in killing himself. Once again, Linda discovers another fact that hints to the supposition that Willy wants to die. She finds a hose attached to the furnace or some utility machine in the cellar which could not be good for one's health. I think Linda knows Willy will eventually become successful, and she does everything in her power to stop him. In the end, Willy takes his life by getting into an accident and there is no more suspense in the play.

realistic?

Throughout this play, there were aspects of both realism and unrealism. The lives of the characters and some of their experience can be seen as real, while the flashbacks and visuals experienced by Willy are not realistic at all. The Loman family in the flashbacks to when the boys were in high school can be compared to real life families at that time in history. They had a father who worked, a mother who stayed at home and took care of the house, and two boys who liked to be boys and play sports. Even when Happy and Biff left after high school, the family can still be seen as normal. Biff and Willy had their problems, and were unable to sort them out. Problems like that exist in reality.
The unrealistic parts of the play were when Ben would appear to Willy at parts in the play. Willy had no idea that Ben was just an imaginary character and would carry on a conversation out loud with him even when there were people around. I guess the unrealistic parts were there scenes with Willy's messed up mind that kept trying to live in the past.