All modal verbs are auxiliary verbs, which means they can only be used with a main verb. Modal verbs cannot be a main verb. They are used to express ideas such as possibility, prediction, speculation, deduction and necessity.
It looks like the night sky exploded on this dress! :) I just need something to cover up the shoulders <- Agreed! It's looks like a starry night sky, and maybe drape one of black wraps over the shoulders!