I would prefer
Anthea Florence over
Georgia Colleen.
Both have a good flow, but
Colleen is a bit too old lady-ish for me.
The variant
Georgia Colette would probably only slightly improve it.
Personally, I would use the modification
Antje Florentijn or
Anouk Florentine.
In principle, there is nothing wrong with the name
Peter, but in combination with
Lorcan or
Firenze it either does sound harsh or looks a bit strange/weird.
Instead, I would recommend either
Loris or
Florent here,
Peter Loris or
Peter Florent.