I say if you want to take photos of your kids, take photos of your kids. Hell, take photos of any flipping thing you want, especially if you enjoy taking photos (it's one of my new GAL passions).
What I wouldn't do would be to force the pictures on your W or even show them to her, especially since she's told you she doesn't want that right now. That will feel to her like pursuit and manipulative behavior given your current dynamic, IMO.
Me: 46 W: 44 Married: 17 Together 21 D13; S10 BD: 03.03.15 (Not attracted to you) Almost 2 years trying, alone, to save marriage Status now: Divorced (effective 06.13.17)