How to denote/mean "kindness"

Hello everyone,

This question may get a little abstract...

I am cataloguing a series of vintage illustrations and I am trying to do it also in English... I had no trouble in selecting "tags" for groups of images with similar concepts, until I found the images illustrating acts of kindness (as a kid thanking another for a gift) -- how can we talk in English about the beautiful words these days without sounding too sweet, romantic, naïf or even religious?

The first word that came to my mind was "Gratitude". Personally, I love this English word, I believe it's bold and inspiring, specially as a title for a group of images, but I'm not really sure how overused/abused this word may be these days across English-speaking cultures. "Kindness", maybe?

The next possibility was the phrase "To Give", or "Giving", or "Thanking". Could any of these options be used as a title, as a complete idea, without any complement? For instance: can I use "Thanking" as a title or I must add the "for [Something]" after it? Does they sound "too" inspirational?

Take the example of an illustration that shows two scenes: in the first one, little girl A gives a gift to little girl B; in the second one, little girl B gives a flower to little girl A in their way to (or back from) school. Does this sequence bring any word/concept to your mind?

Thank you!!!