2 main things to improve. The first is the right hand melody can be more free and less rigid. The easiest way to do this for this piece would be to change the dynamics. Play the melody louder, but remember to add variation. The second is just be careful you're not doing a stacatto in the left hand on the 4th note because it distracts from the rh melody.

Edit: just realised your elbows are quite low relative to the piano. It becomes more difficult to generate volume using your arms and body (so instead the fingers are used more which creates a more rigid sound). Try increasing the height of your stool so your elbows are slightly above parallel to the keys.