If I were in your shoes ... it would drive me FN crazy to have the woman who left me and is sleeping with someone else send me photos of herself every day. To me that would be just torture. I would draw a boundary -- tell her in gentle but firm words that you do not want to receive those photos. They are not appropriate for where your relationship is (or where it isn't, really). They are appropriate for her lover, not the H she left. If she doesn't respect that, close your snapchat account. I know she sends you photos of your D, but you can live w/o those. You can have quality time w/ your D in person.
Me: 50, MLC/WW 45 Young kids Nov 2015: BD1 Apr 2016: BD2 Jan 2017: W filed Feb 2017: D final