We used the Simply Charlotte Mason Picture Study Portfolio for the inaugural term of our learning community. We studied Fra Angelico as he was the Ambleside Online artist chosen for that term. (Our first two years, we stayed with the Ambleside Online artist selections.) The portfolios are put together by Emily Kiser, a Charlotte Mason educator who majored in studio art. You can purchase just the set of prints or you can buy the whole kit. I recommend purchasing a full kit at least once if picture study is new to you and you are short on time to research yourself how to do one. It provides a wonderful model of how to do a picture study with your family. It explains what a picture study is, why and how to do one, and steps you through how to spend your picture study time. It also includes a living text on the artist and additional information on each of the pictures included in the portfolio.
We used Riverbend's artist study on Jean-Baptiste Camille Corot for the first term of our second year. These prints are just as beautiful as those of Simply Charlotte Mason, but the sets will only include the prints with no additional information. Recently, though, they have begun to include Parents' Review articles with some sets, as the pictures included in the sets were taken directly from the articles. These sets will say "PNEU Historical Collection" in the title.
I knew others created picture studies and generously shared them as PDFs for free. One simply needed to download the PDF and print it at home or send it to a printer (Staples, OfficeMax, Office Depot, Wal-Mart, Walgreens, Best Value Copy, The Homeschool Printing Company, or a local mom-and-pop shop)*. This was a good intermediate step.
Cottage Press
A Generous Education
A Humble Place
Well Read Kid (these print at Walgreens)