It's always impressive seeing well-built bodybuilder girls doing 20+ reps with good form. It's usually only the calisthenics/gymnast/climber types who get the higher numbers due to their specific training and lower bodyweight.
I find 16 reps is the point where a pullup showing becomes impressive even for a strong girl and it quickly scales up from there. 20+ is crazy, 25+ is godlike, 30+ is just mind-boggling.
Who can so the most pullups/chinups with the best form?
Nice abs are always a bonus like this video of Anna Vitkalova.