A mask for a beginner should be the right size for the face and have a short tube for surface snorkeling. If there is a choice of color, then let them get the one they like. This will enhance the experience. Make sure the mask fits snugly on the face without pinching it. It should not be uncomfortable. Keep hair away from the contact places of the mask with the face. Beginner masks do not have to be expensive and full of features to be enjoyable and a good piece of equipment.