Answer:
I think the answer is value. I'm sorry if this isn't correct I'm not really good
I think Costuming is an art because you put the Costume together, with your own ideas, like when you paint, you put in your ideas into the painting and make it your own. I think it is the same way with Costuming.
The difference between realist art and modernism art:
Realist art is something that's drawn or painted to portray a realistic object. They would make it look real, like a person or a fruit, almost like it would look if you took a picture of it with a camera although they didn't have cameras when realist art was invented.
Modernism art is a type of art that has more colors, lines, and details. It is a stylish type of art that requires complicated uses of form.