Don’t throw out your old canvas paintings because you can paint over them. Especially that busy paint job you outgrew.
Sometimes simplicity is all you need and that’s what I did for my daughter.
I painted a solid gray over the painting. I then used a paint pen to do the feathers. I didn’t have to worry about smoothing it because it wasn’t textured. If you have that issue then sand it down first. You may also have to prime over old paint work in case it is oil based.