http://www.fireandknowledge.org/archives/2007/01/08/a-guide-to-writing-well/ This link provided some solid advice. And to add to the reading list on advancing the craft, try...
How to grow a novel : the most common mistakes writers make and how to overcome them / Sol Stein.
Good advice on writing : writers past and present on how to write well / compiled and edited by William Safire and Leonard Safir.
Elements of style / by William Strunk Jr ; with revisions, an introduction, and a chapter on writing by E.B. White.
How to write (and sell) a Christian novel : proven and practical advice from a best-selling author / Gilbert Morris.
I appreciated hearing feedback from readers from my March Etc. story about Lora Hazelrigg. She paints murals and here's a glimpse in visual form -