You look so darn cute in everything that it's hard to be critical. I think a cognac belt and wedge sandals might be cute and up the style here. Maybe some "beachy" jewelry. I think the combo of the stripes, color AND the self belt make it read too much "apron" but a different belt, shoes and accessories should change that.
My summer mistakes are often white tees that are too clingy or too thin (or both) and probably just too many tees in general.