Can you pass down your features after plastic surgery to your kids?

No. You will not “pass down” any acquired features; these include any changes that occur after plastic surgical procedures. Best wishes.
Yes and no. You will pass on your preoperative features, not those resulting from surgery.
No. Surgical changes do not change your genetics. Children are a genetic mix of their parents. Even if a rhinoplasty corrects the family nose on you, it may be present in your children.
Traits. You can not pass done acquired traits just genetic ones.