Compliment a stranger

Was at the coffee shop and two girls were in the lineup in front of me, maybe about 12-15 yrs old. Both wearing colourful bright hijabs. I complimented a the younger girl on her beautiful sparkling brown eyes, the huge smiles on both their faces were worth the moment to speak to them. It's really nice when you know you've just sincerely said something that made someone else feel great :)