What goes into a good composition? I could wax poetic about how the golden ratio has been used for centuries to create dynamic compositions; or about balancing the sizes of your objects, or where to place your horizon line. But there are more than enough authors and teachers online that do a better job than I ever could. The same goes for how to structure a written composition.
Believable dialogue is one of the most important skills a fiction writer can learn. The speed and rhythm of a character’s speech tells a lot about their personality, the environment they grew up in and their education. It is essential to give your characters a believable voice to give them life.