The thing about portraits is, that the things that make us look “like us” are often tiny incremental differences. My lips are just a wee bit thinner than others (less than an eighth of an inch in some cases). My mouths static state is turned down, others are turned up. Get even one of those things wrong and all of a sudden that portrait doesn’t look like you! I’ve done very few portraits of other people. Mostly I’ve tried capturing my mother and I’ve failed in all those attempts (in oil, in clay, and in acrylic). It hasn’t stopped me from trying again, though!