When I say I used references I mean I traced, I added the image as a new layer, dropped the opacity and traced them with minimal deviation (that's why the hand starts to look weird when you hover over the radio knobs, I didn't have a reference for that specific hand contortion to trace)
Now from what I remember from paint, I don't think you can do that, I don't think you can add a different layer and change it's opacity. If you found a program that could do that, possibly a purpose built animating software, it would probably make it a lot easier to keep the frames consistent, as you could use the previous frame as reference. (I use photopea.com if that matters)