I am not sure you can edit the question photos either. But your smile is nice, you don't have to worry about it.
I speak and teach Japanese to my 2 kids.
I say most of kids start losing their seconds language when they start learning English at school. It is pretty difficult to keep it up both.
As long as they have basic knowledge, they can always catch up later. Teach them some language and if they are having trouble, you should take it easy on them, so they don't hate the language. Always keep good image of the language and let them think they are good at it.