Welcome and Welcome BACK to hobby! Glad you joined. Probably biggest changes (depending how long away) pods are good, foods, lighting... that's how I'd rate the improvements.
Have you considered starting your build thread? I found its a great place to document my tank's evolution for myself. I started tank first then joined, so I'm still finding myself going back collecting pictures & updating historically as well as current state. Once you create your first post in your thread under Forum > Member Aquariums and link it to your account, they will give you build badge (look left, under my ID)