I'd stay away from the Bermuda shorts. The length can shorten your legs bc of how they are cut. What about jeans and a colorful top? Pink, blue, yellow, etc. Green might clash with the green in her dress. Add Accessories to add interest and movement to your outfit (statement jewelry, scarf, etc). Avoid a black top which can be harsh in photos.
(I just did fam pics and spent way to long figuring out how to dress everyone!)
Black and white are the hardest colors to photograph, so I would stay away from the black top/white shorts option. The black shorts with the button down is my favorite look (roll up the sleeves, maybe add a necklace)