I'm looking for honest opinions here!

On the left is a painting  I did, which hung on my wall for several years, and then my eldest granddaughter completed 'Ocean' and insisted that her piece replace mine. Then my youngest granddaughter tagged her contribution to the bottom of it.
Now despite the passing of time, they still insist that theirs remain. 
Should their artistic endeavours be on show now, or should mine?
I will show the girls your responses and they will have to abide by the majority decision! What do you think?