One of the techniques you can use in your right hand to make your piano playing fuller is to add 3rds under the melody. Just make sure it is a scale note 3rd — anything else will not harmonize correctly. When 3rds don’t work at a given spot in the melody, switch to 6ths under the melody — one of those two will almost always work. For more good stuff like this, come on over to https://www.playpiano.com and sign up for our free online newsletter.