Juniper Faith is a nice combo. Juniper is definitely growing on me lately. I like June as a nickname, too, but I don't really like Juni.
Matilda Brooke is cute. I prefer the nickname Matti or Tilda to Tilly, but that's personal preference. Tilly is a bit frilly for my tastes.
Everett Charles sounds very kingly. It sounds a little stuffy to me. If Charles isn't very important to you, I'd consider changing it to something a little "fresher" to balance Everett out.
Bowen Piper is not my favorite. Bowen definitely sounds like a boy's name. For that matter, is this a boy's name? Piper is normally used for a girl, so that's why I assumed it was for a girl, but I suppose Piper could be unisex. That said, I do not like it at all for a girl. Maybe Briona or even Beryl, Briony, or Piper Blair?
For a boy, I guess it's better than Owen (always sounds weak to me), but I prefer other "B" names like Benjamin, Bryant, Brandon, etc. It's not horrid for a boy, though, just different. I'd like Boden/Bodan or Bowden/Bowdan better, just for the sound of it.
good luck!