So for this learning experience, I am trying to tackle glass and caustics in Houdini. All in all, I want to add additional details to this jar and I remembered hearing about surface imperfection textures. My question is, how might one apply let's say hand prints (which I have a texture for but linking it here would go against the licensing for it) to the Houdini glass shader?

The image is attached below.

And I know the caustic fireflies need some work and attention but that is another topic I feel like. But if you have any ideas on that, I would love to here them. I am currently trying to avoid cranking pixel samples past the 6x6 I currently have them at.

Thank you to anyone and everyone who can help on this. Been putting off Houdini for too long and I am just bound and determined to learn it now.