Mirror test
you could explain to me how you did this some tutorial something I use dazstudio but I do not know if it is the same program or how you did it.
That gif is back when I was using TK17 (with Hook3 lighting), but you can do the exact same thing in Daz Studio, but with far better quality.
What specifically do you want to know how to do?
There isn't that exact bathroom scene but there are many others for Daz. You can add mirror textures to anything.
For connecting the hands perfectly to the breasts I use mscausual's
mcjAutolimb 2015 DS3/DS4 script. After you animate the breasts however you want, create and parent a null node to the outside of each breast, select the null node, then Ctrl select the hand, then run the script.