One word in English what means "gentle smile"?

#1
Hi,

I am looking for a second word for my brand. A problem is what it has to be a noun and one word. the meaning of it should be gentle-kind-smile. Such a smile like a mother watches her newborn, such a smile like two lovers watches each other. Because English language is my second language I find this task a bit complicated, so maybe anybody could help me?

Thank you very much.