''In the middle of the city, in the middle of the street, there is a cafe where its barista will serve you a cup of coffee and love advice.''
Follow the stories of five couples and their internal struggles with love..
Honestly, working off of this description, I think using that first image (with the birds)as your thumbnail would be really good if it has a lot of significance to your story. Like, if the café has a logo that resembles the image.
I think it (the first image) gives a better sense of intrigue. When getting people interested in something, sometimes minimalism is key, because it forces people to investigate further if they're really interested in what you have to offer. But depending on the tone of your story, it might be too lighthearted.
Hopefully that made sense