Lots going on with this list OP - very mixed bag!
I really like Marina, and Inez, Claudia and Silvia are quite nice too (although I prefer it spelled Sylvia).
Mabyn - this looks odd, like a mash-up of Mabel and Robyn. I love the very similar Merryn though.
Salome - definitely not, too much Biblical baggage
Magdalene - ditto. Makes me think of nuns!
Celine - really pretty sound, but too closely linked to Dion. Selene?
Delphina - too fussy. Delphine is ok but I’m still not a big fan
Priscilla - definitely not, brings to mind Presley and the word ‘prissy’, plus the only obvious nickname is Cilla, which is dreadful.
Celestine - actually quite like this; has a very mellifluous sound but it’s a bit ‘much’ for a first name. Middle name maybe?