Wow another Yvonne fan!
I have also looked for photos of her naked in the past, but nothing . Yet I am sure that she is certainly not limited only to photos "dressed". The only nude photos of "her" found online are actually of Aletta Ocean who vaguely resembles her.
If, like me, you are a fan of big and fake boobs, I also recommend instagram models like Eriana Blanco and Angieliciious (very hot but unfortunately no nude photos here too).