Ah love that song! 
Good job!
For this song there is no real issue when it comes to power but there are some ways to improve pitch.
From the angle of the camera it’s hard to tell whether you are bending over or not.
I do have the feeling you’re lifting your shoulders a bit; relaxing them and letting them hang more could benefit your singing.
I will sound like a nagging singer stating once again standing up would be the best idea for a bunch of reasons 