Please wait at least 24 hours before reporting that you've lost your verified status.
When you change your pictures, your verification is re-checked. If we can still see your verification picture matches your face and body pictures, public and private, then it will be re-approved. You don't need to do anything.
You may have uploaded pictures we can no longer see obviously match your verification picture. In that case verification will be refused, and you'll be sent an email explaining why. You may need to upload a new verification pic, or you may need to upload a pic that 'links' your existing pics; (for instance, if you have only headless profile pics, and your verification only shows your face, a new face and chest profile pic may make it clearer that the existing body pics, and the face only verification pic, are the same person.