I agree with Sangoma - attending national portfolio review provided the feedback I needed.
Here’s a sample of my HS portfolio from 2004! It’s missing few pieces but you get the idea.
Still life & portrait focused with varying materials to show capabilities. My high school did not offer figure drawing classes so I signed-up for a local community college evening classes as part of the running start program during my junior year.
Applied to Cooper Union, Pratt, Parsons, SVA & RISD. Accepted to Pratt, RISD, Parsons & SVA, ultimately chose Pratt.