Banner Art: Exploring Jim Kay's illustrations of Diagon Alley

Jim Kay's illustration is a cornucopia of Diagon Alley places in a row. The details are abundant and it now features as our community's banner.

The site I extracted it from allows you to look at the details closely - and has a related challenge:

Unlock activities by finding these items. When you have found them all, you will receive a magical certificate.

A red dragon with a book and quill

A sea-faring unicorn

A witch and a Golden Snitch

A potted sunflower

An elephant and castle

A white cat on a roof