People who see you for the first time will judge you by your looks. Whether that is the right thing to do or not, that's what they do. So if you go to a client who sees you for the first time, they will judge you by your looks.

Good makeup will make you look attractive. But your customer will not care much (professionally) whether their accountant is attractive, they want an accountant who is competent. The makeup doesn't make you look competent. Instead you might want to get help from a professional picking clothes, possibly a hairstyle, that make you look competent.

It's not about makeup.

People who see you for the first time will judge you by your looks. Whether that is the right thing to do or not, that's what they do. So if you go to a client who sees you for the first time, they will judge you by your looks.

Good makeup will make you look attractive. But your customer will not care much (professionally) whether their accountant is attractive, they want an accountant who is competent. The makeup doesn't make you look competent. Instead you might want to get help from a professional picking clothes, possibly a hairstyle, that make you look competent.