If you’ve got two sows, then a 4x2 c&c is a perfect size for them.
If you’ve got two boars, then a 4x2 is the absolute minimum size and a 5x2 is recommended
it does look like they would benefit from something more to do - some more tunnels, multi exit hides added for example.
Personally, I don’t use hayracks and instead I just put large piles of hay around directly on the floor (mine are also bedded on hay). I find that they eat so much more hay when they don’t have to use a rack. Plus, a big pile of hay on the floor is a lot of fun for them, they can run through, burrow and hide into it and forage through it in a much more natural way. i mix their one tablespoon per day of pellets and their veg into the pile of hay rather than using bowls as it again, encourages foraging.
Depending on your piggies, using enclosed hides like you have can be problematic. It is recommended that all hides have two exits so no piggy can get trapped in one by the other, particularly if your piggies are teenagers.
I have boars (not teens anymore) and always go for plenty of hides so they have lots to do and use several tunnels for them to run through and chew. I’ve got got a couple of cardboard boxes in their cage with two or three holes for doors cut in for them to play with.
What are those coloured things hanging either side of the hay racks? Are they those hanging seed treat things? If so, then I’d recommend you remove them. They aren’t suitable for piggies.