While Wikipedia remains an unauthoritative resource and should not be cited it can be useful for your background research.
For example a look at a Wikipedia entry on Shepard Fairey reveals several links at the bottom of the page which could be useful.
https://en.wikipedia.org/wiki/Shepard_Fairey
Scroll down to the bottom of the page to References and here you will find a list of linked sources you can use. number 25 is a biography
A blog is an informational website published on the World Wide Web consisting of discrete, often informal diary-style text entries (posts). Images of the artist's work are often placed in blogs. The term \"blog\" was coined by Jon Barger in 1997 and popularized by Evan Williams in 1999.
The information you may find in blogs could be images, interviews, or viewpoints on the art's work.
With blogs, scholars get a chance to let a broader public get a glimpse of ideas as they form, and see how scholars test things out in an environment more open and forgiving than a professional presentation or publication. Blogs also allow scholars a venue for educating a broader public.