I would like if the Yousician certificates included the option to add more details like a score that reflects if you really aced a section as opposed to barely passing it, what rank you hold out of all the players who completed the section to date and any songs you ranked in the top three for. This should be optional because some folks probably just want to pass and get the current certificate but it might be a good motivator to those who are a bit competitive. It could even be something more general like "Completed" for bare completion, "Completed with Great Skill" for better scores or "Completed with Mastery" for almost perfect scores. Something along those lines.