I love
Louise for its sleek, slender elegance; unlike most French names, it's firmly part of English usage, which also helps. I wouldn't use it myself, because I like
Lucy even more.
I don't find
Louise Rose pleasant at all. The -se echo makes it sound like something Dr Seuss tried out and discarded.
Louise Rosalie would work;
Louise Rosamond and
Louise Rosalind too, and even
Louise Rosemary, though I'd prefer
Rosemary Louise.