One of the blogs I love is the Bookshelf Muse. There is a wealth of information provided on this blog. Most of it has to do with how to describe physical attributes differently. I know I tend to struggle with how to describe a "thin" person as something different. How would you describe arms or backs in a way that is clear, appealing, and doesn't' take an entire paragraph?
I wish this blog was in book form because I would buy it. I hope you find it as enjoyable as I do!