Thank you dear ! ;-)
This is really not a secret as I have explained it in this post https://steemit.com/art/@barbara-orenya/background-for-my-painting-w-i-p-creation-d-un-fond-pour-mon-tableau-eng-fr LoL ^_^
There are some collages and some stamped, I don't know which letters you mean so take a look at the tuto's link =))