The first is "Where Woman Create" by Stampington Studios. It is full of inspiring pictures and stories of artists, their work and their studio. You can see some issues here: http://www.stampington.com/html/awc_02032009_wwc.html
Another useful and inspiring magazine is "Studios" by Cloth.Scissors.Paper. It can be seen here: http://www.interweavestore.com/Mixed-Media/Magazines/Studios.html Both magazines can be ordered online or bought at JoAnns or other craft stores.
Nineteen inspiring sheds like the one pictured above can be found on the "Sunset" page: http://www.sunset.com/home/outdoor-living/great-backyard-sheds-and-cottages-00400000058405/page22.html Be sure to click on the artist shed in the group!
Here is a very interesting group of pictures of an artist shed being built - be sure to go to page 2! http://www.alexandrablythe.co.uk/shed.htm
Finally, I found a short article about considerations in building your art studio in a shed: http://www.associatedcontent.com/article/2034791/find_inspiration_with_a_beautiful_artists.html?cat=2 The author has written many more articles on sheds: http://ezinearticles.com/?expert=Florin_Ciobanu I stopped counting the shed articles at 50 - a wealth of information is here!Please look at the shed books in my posts and my Amazon list on the right side! They are the best shed books I have found for inspiration! Have fun planning a studio!
If you have an artist's studio or shed, send me a picture and I will post it - (my email in profile) or send me a comment about your studio!