When I decided to paint more than one shoe the 8" square seemed to work best.   Painting looser is something I have been trying to do.   Losing edges is a goal also.   After taking this long break from painting my perspective seems different also.   
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My blog: http://claudiahammer.blogspot.com 
My website: http://claudiahammer.com 
My email: iclaudiahammer@twc.com 
My DPW gallery: http://www.dailypaintworks.com/Artists/chammer-209

