Q: I am in another profession. I am an art major and I want to serve overseas. Will my art be helpful in church planting among the unreached?

A: Yes. Be a lifestyle witness.

Answer from Ken, webmaster of http://www.missionresources.com
You could give lessons in art in another country if you knew the language. You could use that opportunity to share the gospel or invite your students to church just like others do using English lessons. You could take art classes in overseas and witness to other art students. You could share the gospel outdoors using art. Draw portraits of people and show on the same picture that good works, church, etc will not get them to heaven. (Draw the bridge diagram tract.)

Editor's note: see the book
Taking It to the Streets: Using the Arts to Transform Your Community
by J. Nathan Corbitt and Vivian Nix- Early
This practical handbook combines reallife stories with tested methodologies to create a new paradigm for the role of the arts in Christian ministry and mission. Taking It to the Streets provides a historical perspective and theology for understanding the transforming power of the arts, a vocabulary for discussing the arts outside the sanctuary, and creative methods for turning faith into action in society. An ideal textbook for urban missions and youth ministry courses, Taking It to the Streets will also be a valued resource for churches devoted to creative mission.
https://www.worldvisionresources.com/product_info.php?products_id=262