Concordia University in Chicago has developed FREE monthly artist study lesson plans for grades one through six. Here's a link to the site. I looked over their offerings and selected the plans for grades two, four, and six and dowloaded the Adobe file.
Northern River, by Tom Thomson, featured artist for Lesson 2, Grade 6
Each plan provides a biography of each month's featured artist and background information on the selected artwork. The the plan suggests ways to lead students in "directed observation" of the piece, which consists of several questions and things to consider. The plan wraps up with a Things to Do section for students, offering options for their own artwork or comparisons with other pieces by the same artist.
Since picture/artist study is not my strong suit (read: I need all the help I can get), I'm looking forward to utilizing this resource in our home school.