Isabel is an elegant classic, fairly timeless and so probably my fave (I know a few of different ages).
Audrey is retro cool again now but it will still be “old lady” to some, it’s more a marmite name (although personally I like it because it reminds me of the Twin Peaks character).
Nothing really wrong with Tessa but it’s a bit blah imo - it’s neither the cool, wild romantic vibe of Tess, nor the elegant classic of Teresa (it’s trying and failing to be both).