There are no real rules when it come to unveiling the bride. Many people feel that it is traditional for the farther to raise the blusher of his daughter's veil when they reach the alter before handing her to the groom.
However, lots of brides choose to leave the veil down until after the vows, when the groom lifts the blusher for the first married kiss.
The most important thing is to feel comfortable, so ultimately the decision is entirely yours! x