The way he looked at her made her finally believe.
First, looking into her eyes, memorizing the feeling he had while doing so.
Second, looking her up and down.
Next, he looked away almost processing the thoughts leaving him speechless.
Again, looking her up and down again then made his way back to her eyes.
After that, he would let out a small sigh under his breath
Finally, he found the perfect words to say, "You look beautiful"