Hairstyle for low cut back?

Hey guys! Just need suggestions for what to do with my hair. My inspiration/style is vintage bohemian and we are having a garden wedding. I thought I wanted half up/half down and just wasn’t crazy about it after my trial! But, maybe i’m just being picky. My dress has a low back so unsure if I should have it up or down. I want bohemian down...but, as you can tell I’m TORN! I’ve included some photos of my hair trial as well as my dress back (don’t mind my messy room, lol), thank you so much!