I'm not really sure how to treat the photography of someone else's art, but to give credit where credit is due this is an isolated view of a sculpture by artist Blue Sky. Columbia, SC. http://www.blueskyart.com
My father and I agree, these are excellent shots of his sculpture, "Busted Plug Plaza." You are quite welcome to snap photographs of public sculptures, and you may sell artistic detail photographs (such as these) under U.S. art laws. We only ask that photographers do not sell images that encompass the entire work, because that would cut into our own sales.
Those curious may find the full sculpture here: http://www.blueskyart.com/pub11.html
Thank you for the recognition! You're quite a talented photographer.
Paul and Wayne, Thanks for your votes of confidence on capturing the work of others. I feel the same but have never really heard others viewpoints on the matter... CG