Awwww how cute!!
I've noticed your subtle asymmetries, too. I remember seeing something about a Japanese concept of art. I can't remember what it was called, but they recognized beauty in imperfection. So, if a building had columns, say, they would purposefully install one column upside down. It's very interesting. You can see this in nature, too. Trees, plants, animals and people all have this. Even the most "perfect" faces have some slight asymmetries.
So, it's really cool you add some asymmetry to your work! It certainly makes it more dynamic.