U+1F60D · emoji since 2010
Heart eyes means I love what I'm looking at, instantly and completely. It works on people, food, outfits, sunsets, sneakers, and basically anything that deserves an enthusiastic wow.
It's flirtier than a plain heart but still safe to send to a friend's new haircut photo. If 👍 is approval, 😍 is full admiration with the volume turned up.