Up to you, but you don't look as good as you could in the photo, I noticed it, so will other people.
I would never normally say something like that, but as you were asking for honest opinions I thought you might just not have realised it would look far better with a supportive bra, and you mentioned control wear in a previous post, so thought it was not off the table to discuss.
Women get their hair and make up done, wear control wear, wear high heels and do all sorts of things that hide or change their features and characteristics to look good, a supportive bra is just another one of those things.
Entirely your choice, and as I say I would not say anything normally, but I'd think it.