It looks amazing. Probably best to give them a couple of weeks without disturbance or cleaning now after the changes to give them chance to adjust and re-scent mark everywhere
Just wondering what diet they have? It looks like quite a bit of lettuce or cabbage in the cage? Both of those arent particularly good for hamsters - can't remember why. Maybe a tiny bit very infrequently. There are lots of other veg they can have - broccoli, carrot, cauliflower, peas. Also wondered what their mix is as it doesn't seem like a muesli. Burgess Dwarf hamster food is a good mix for dwarf hamsters.