Choosing the right LinkedIn photo is no easy feat: you can’t just upload your latest selfie and expect to score your dream job. The snapshot should be professional, and show prospective employers that you’re the perfect person for a role without looking too staged or cheesy. Choosing an exemplary photo just got more involved: new research suggests looking at least a “little” happy in your picture will make you appear more trustworthy to prospective employers. So what does a “little” happy mean, as opposed to just, um, regular happy? Through a series of experiments, researchers at New York University found that people who weren’t overtly smiling or laughing like hyenas in their pic, but rather adopting a positive, upward-curving expression (upturned eyebrows included) seemed like more reliable candidates.