There are some great plugins available for creating user profiles. I’d recommend searching the “Plugins” directory for “Profile Builder” or “Memberships”, for a full list. There are also plugins which handle portfolios.

This may require a small amount of custom coding to get the portfolio items to show on a specific profile page.

You could also look into BuddyPress, which comes with a profile system, and then try a plugin like Jetpack for portfolio items.

All of the best with this.