Other than the water bottle others have suggest needs moving i would add, a bigger cage. Boars need alot of space. Toilet roll tubes are a must in my cage's Piggys love them and its recycling for you. I would love to see some cosy's, tunnels and wooden toys too. Toys do not need to be expensive, my cages are full of carboard box's and toilet roll tubes, kitchen towel tubes, sheets of newspaper for them to nibble and drag about also work.
As a first timer my cage was almost like yours to, so dont be offended by my post.