I love
Liana! I think it's sweet, pretty, can be mature (a lot more mature than
Tiana for some reason), and usable yet uncommon.
Liana is my favorite of those, then
Leah, then
Lydia, then
Liliana.
A few other L names I like are
Liora,
Lyra,
Laurel,
Lea,
Lina,
Linnea,
Luna, Lirael,
Leia, and Leora.