HAPPY BIRTHDAY！UR GREATEST LOVE HAS MADE ME A BETTER PHOTOGRAPHER & I'LL CONTINUE 2 CAPTURE THE BEAUTY IN U w/ LOVE.
Oh noooo
this can be interpreted in so many ways
"ur greatest love" - ayu's lover; ayu's love for
something; Her greatest album "love"
"ill continue to capture the beauty in u w/love" - AKA he's gonna take dem photos WITH HIS intangible love (do it in a special, loving way); He'll capture Ayu's beauty by USING her album 'love' (although how he will do that i don't want to know).
And many more
you can thank Syntax for all the meanings.