How can I make this more descriptive?

Max had just arrived at the outside clroom where his lesson was to be held. It resembled a circus stage in some ways, with wooden bleachers that were sanded down, and trees surrounding an arena of elevated dirt. Max was amazed on how many students were taking the cl: three rows of bleachers were already filled with his new clmates waiting for the teacher to arrive. As he approached, everyone stared at him, their cruel expressions digging into his stomach. Showing no outward discomfort, he took a seat at the bottom of the bleachers. Another student in the same row slid over next to Max.