Ask your teacher. The majority of art teachers in Michigan belong to several art organizations, and yours may be savvy to local scholarships you can apply to. For example, the Michigan Art Educator Association sponsors three scholarships, which are awarded to youth members.
Check your local and regional art guilds and leagues. Michigan is full of artists, and artists are known for supporting their crafts. For example, if you live in the western portion of the state, the West Shore Art League, based in Ludington, sponsors scholarships for local students. If you're in the Metro Detroit area, check with the Detroit Artists Market for funding opportunities.
Look on the state and federal level for artist scholarship opportunities that will be applicable to a Michigan university. For example, ArtServe Michigan offers scholarships. The National Cowboy & Western Heritage Museum also offers a $5000 scholarship to a US citizen between the ages of 18 and 35.
Contact the specific school you plan to attend, as college websites will offer scholarships that are available only to their students. For example, in 2010 the Kendall College of Art and Design of Ferris State University in Grand Rapids listed 14 scholarships for its students.