I love [name_f]Valentina[/name_f]. The two names on your list are pretty enough, but you’re right, they don’t have that oomf [name_f]Valentina[/name_f] does.
A few ideas:
[name_f]Adora[/name_f]
[name_f]Adelaide[/name_f]
[name_f]Artemesia[/name_f]
[name_f]Celestia[/name_f]
[name_f]Dorothea[/name_f]
[name_f]Lilliana[/name_f]
[name_f]Melisande[/name_f]
[name_f]Paloma[/name_f]
[name_f]Daria[/name_f]
[name_f]Marcella[/name_f]
[name_f]Fiammetta[/name_f]
[name_f]Flavia[/name_f]
[name_f]Drusilla[/name_f]
I hope this helps! Congratulations and welcome to Nameberry!
Since older sister’s name ends in an “a”, I think it’s nice to change it up and end the name in a different sound
Some gorgeous feminine names that sound different but aren’t over-shadowed by show-stopper [name_f]Valentina[/name_f]
[name_f]Marigold[/name_f]
[name_f]Danielle[/name_f]
[name_f]Josephine[/name_f]
[name_f]Florence[/name_f]
[name_f]Chanel[/name_f]
[name_f]Antigone[/name_f]
[name_f]Adele[/name_f]
[name_f]Arabelle[/name_f]
[name_f]Noelle[/name_f]
[name_f]Mirabelle[/name_f]
[name_f]Siobhan[/name_f]
[name_f]Valentina[/name_f] & [name_f]Olivia[/name_f] sound beautiful together as sisters! Never been a fan of the name [name_f]Penelope[/name_f] though.
[name_f]Liliana[/name_f] nn [name_f]Lily[/name_f]
[name_f]Sienna[/name_f] ([name_f]Valentina[/name_f] and [name_f]Sienna[/name_f] are [name_f]Adriana[/name_f] Lima’s 2 girls)
[name_u]Sierra[/name_u]
[name_u]Paisley[/name_u]
[name_f]Rosemary[/name_f]
[name_f]Elena[/name_f] nn [name_f]Ellie[/name_f]
[name_f]Lilibet[/name_f]
[name_f]Lola[/name_f]
I actually really like [name_f]Penelope[/name_f] and [name_f]Valentina[/name_f], here are some other ideas-
[name_f]Aurora[/name_f]
[name_f]Portia[/name_f]
[name_u]Harper[/name_u]
[name_f]Lucy[/name_f]
[name_f]Scarlett[/name_f]
[name_u]Evelyn[/name_u]
[name_f]Rose[/name_f]
[name_f]Daphne[/name_f]
[name_f]Juno[/name_f]
[name_u]Piper[/name_u]
[name_f]Dominica[/name_f]