I just showed you repentance symbolized with ashes. We are now back to what I said earlier was going to happen, namely that some Catholic detractor, having been shown a Scriptural source for a Catholic practice was going to insist that "that can't possibly mean what it plainly says"
And here you are.
Now if you don't mind, I'm trying to study. Unless you can show me Biblical instruction calling for Bible study on Wednesday night we probably should part company now.
You have shown a few examples where ashes are used as an expression of repentence in the OT. You have not shown at all where making a mark on ones head with ashes is anything Scriptural.
However, I have shown you that making a mark on the forehead is a pagan tradition and practice.