May I suggest controlled random? Like a couple commenters suggested, one on most leaves, but not on all. And put an offset pair in a few spots. I think a butterfly might compete with the flowers, but a few ladybugs on the vines and or bees flying about might be an unobtrusive but whimsical touch.

At every leaf and more - may be different flowers on some.

I vote for each leaf. I like the colors of the flowers and I think it adds something to the quilt.

I like the random but would be cute if some of each were placed........

If you are like me, random doesn't work; it never looks random or balanced.
I'd go for a flower near every set of leaves.

I like a flower with each leaf set.

I like it on the leaves.

I like the flowers on the leaves because that is usually where a flower is.

I like the random, but I think you need more or maybe a variation in sizes. Love the colors!

What an adorable quilt. I, too, enjoyed a flower at each set of leaves. I also love the idea of a random butterfly, and/ or dragonfly.

Ultimately, what does SHE think? That's what really matters :)

You are so sweet to do this for her.