Which form of advertisement is most efficient for a striving artist?

[§n4k3y]

The best possible ways to advertise is to generate leads, instead of advertisement for this kind of items/products/services. What you can do is facebook, Linkedin, E-mail marketing which are basically free.
Other than that you could take appointments from prospective clients and give them presentations. Instead of advertising it to the mass. because the mass wont be needing your product/services instead a specific niche will be. If you can find that specific niche segment of people you can send leaflets or appointments for presentations or E-mail marketing would do. I do not think mass communications will help but only raise your expenditure.