How to recommend eyebrows or eyelashes to customers who are doing manicure? Where can I learn this kind of progressive sales?

Honey, you are a manicurist. You can intervene in the customer's conversation and mention it when chatting with the customer, or just when a customer has finished eyebrows or eyelashes, colleagues will praise you together. You can also tell customers, such as there are activities in the store, etc., mainly to narrow the distance between customers. Don't be too deliberate. It would be better to say it easily. Come on, you'll be better.