Back to the start! Have you noticed any different behavior from her since you've found the pictures, towards you or anything? None of the pictures you've shared look like they were taken by another person. The big deal is IF she sent/shared them to anyone and how likely is that?
I'm sure you've already done this, asked yourself if she has truly sent these pictures to someone without telling you. Your own answer guides everything here. If you want a hot wife then you have to guide things to where it isn't a "secret" thing. If you don't want a hot wife and you don't want a giant confrontation then keep your mouth shut and your eyes open. When you're sure you can confront her.
If you work it right and pay close attention you could be living the dream! Not every wife takes pictures of herself naked in the bathtub. That's a big head start in and of itself!