If you dream that you see the dragonfly, who lands on you, then it shows the return of someone very important form your past. The dead dragonfly signifies new that wont be pleasant to you. If the dragonfly perched beautifully on somewhere, it shows that you will have someone in contact with you, but it will bring too much stress for you.
Dragonfly dream meaning
Read more about dreaming of Dragonfly in other dream meanings interpretations.