If you’re uninformed, you might just think this is a boring portrait of a lady fanning herself.
But she’s actually a subtle coquette whispering to you in fan language. There is a long history of a silent hand fan language that women use to attract lovers when out in public. Spanish women used to have pretty confined circumstances and in homosocial (restricted to one’s sex) high society they rarely had time alone to themselves to consort with other men.
So, they had to talk via the fan when they were out at events, like the bullring or the opera.
Of course, the men knew this too, as did the servants, so it was not very easy to get away with. But in those times in the Latin world, affairs were quite the norm, though monogamy was not openly flouted.
These little fans are called “abanicos” in Spanish. Here’s an article in Spanish which has some more information on the way one spoke with the hand fan.