IF I would want her to know I have a new and improved Lover, I'd probably post a photo of doing something cool together with New Lover on social media that I know Ex-Lover checks, like Facebook or Instagram. If Ex-Lover cares, she will track your social media and find out that her place is taken. If you send it to Ex-Lover directly while she's no longer interested anyway, the picture will just look like thumbing your nose at her, which is not something a mature man should do.
I once had a video of us on the ferris wheel in downtown. And we made out. If she's no longer interested, it'll mean absolutely nothing. If she's on the fence between you and other guys (hopefully they're not celebs or Tyrone) she'll try coming back if she's only left with simps. Unless they're spending lots, you'll be respected as the guy who exercised his options and walked away.
No date= score 0.
Date with uninterested woman= score -2. Also you're out 50 bucks.
BTW do post pics of you doing cool things with other women. Helps with social proof and shows preselection. Why do you think guys post pics on vacation with models or other hot chicks. Spin the story into something that makes you desirable. I posted a pic with some NFL cheerleaders and I got a lot of both male and female attention. I did convert 2 of these women into actual dates, others were intimidated.
When you have options and aren't afraid to walk, stand on business. If anything, you better give off energy that you can get another woman and replace her! Women do the same to us, hence their orbiter and ex list in their phone.