I've been an AP art teacher for many years; here are my best tips for you to create an art portfolio that stands out.
My website: https://www.jordanswain.com/ - visit the "learn" page for free art projects and lessons.
Websites to look at for inspiration
www.artsy.net
Tips from California college of the arts: https://www.cca.edu/newsroom/top-10-tips-creating-best-art-portfolio/