DaMoshe: While you might not be inherently wrong (you are about Bal Tosif, but not about the rest), no one is trumpeting any Halachos here. The Kallah for whatever reason wanted her face covered. She didn’t say it’s a Chiyuv, her father didn’t say it’s a Chiyuv, no one said it’s a Chiyuv. All we know is she covered her face. That’s it.
Oh, and it’s a B’feirush Gemara that it’s Assur L’histakel Bifnei Kallah Afilu L’chab’va Al Baalah.