She looks great in her dress but the view from the back (which most people will see in the church) makes her look like terrible.
Will she be wearing a veil? A lacy veil, falling down past her shoulders, will distract/cover up/obscure the tattoos for the wedding/front of the church part ... she doesn't have to have the veil covering her face for the walk down the aisle - I didn't!

As for the original bride, find some theatre folks, or go to a "good" costume supply shop. The "clown white" the pros use is not greasy at all, and stays on for hours and hours. I am guessing they have "flesh-toned" stuff that would do the trick as well.