advertise. It depends on how much you want to do this a side hustle or make it your permanent business. Some cheap and free ways to get started would be to make a facebook page and instagram page specifically for your make up artistry and continue to post new pictures of your work, get friends to share the page and its content, social media can be powerful if used right.
If you were wanting to go further than that, you could start having your company listed on google if you have a physical location etc. Or paid advertising on facebook and google etc – but like I said, that is more a question on if you want to make this a business and put money into advertising it and listing it. Like they say, you gotta spend money to make money!