What is good way of advertising for a cosmetic company?
This sounds like a question for an advertising agency, not for lawyers. The legal aspect of advertising for a company that sells cosmetics has to take into account not making claims the product can’t back up, but I don’t think you’re actually looking for legal advice. Disclaimer: Please note that this answer does not constitute legal advice, and should not be relied on, since each situation is fact specific, and it is impossible to evaluate a legal problem without a comprehensive consultation and review of all the facts and documents at issue. This answer does not create an attorney-client relationship.