Everyone (adults, young people and children) have the right to privacy and so their consent should be sought when obtaining information about them and images of them. If the young adult is under 18 years of age, then informed consent should be obtained by a parent or legal guardian. If the child or young person does not want their image to be used or taken, then this should also be respected.
As a player in the public eye you should be aware of child protection issues and keep them in mind when posting any media with children or vulnerable adults in it. Please consult your country’s and National Federations’ Child Protection policies.