Congratulations on the babies! Mom doesn't look terribly happy in that picture
I hope she's feeling better now that the babies have been born. Also she's a very pretty rabbit.
If mom hasn't built the babies a proper nest, then you will need to give her a hand. You will preferably need some soft grass hay to make the nest and make a little hollow in it for the babies to nestle down in. Then you will need to line it with mom's fur. Usually the mom makes the nest and pulls her own fur prior to having the babies, but if she didn't then you need to carefully try pulling some from her belly area. This will also help expose her nipples to make it easier for the babies to find them to nurse.
The babies need to be checked at least a couple times a day to make sure they are healthy and nursing alright. Momma buns usually only feed once or twice a day and leave the babies alone the rest of the time, so the babies should have a nice full belly at some point in the day. If they start looking like they have wrinkly skin, that usually means mom hasn't fed them and they are dehydrated. She will usually start feeding them within 24-36 hours after birth. If she hasn't then you might need to step in and help mom nurse them. If they go more than 48 hours without nursing, they likely won't make it. This link has some good info on what to do to take care of accidental litters.
As the others have mentioned, shavings aren't the best for rabbits, so if you can set things up differently that would be better. Plus with your bun having fluffy fur, you won't have to always deal with the shavings getting caught in her fur. I would suggest using a litter box with something like wood or paper pellet litter, then you could try fleece fabric on the bottom of her cage, as long as she doesn't like to pee on it. This type of set up would also keep her from getting stuff tangled in her fur. If you do try this, you will still need to have a nice little nest for the babies. Usually this would be a nest box big enough for mom to turn around in, filled with the grass hay and lined with mom's fur.
Here is what a proper nest should look like. Good luck and we'd love for you to continue to share pictures with us as the babies grow up.