I think these visuals can help explain some of what I talked about in my opening post here in regards to the different way Sidhe and Tuatha energy comes across to me. I first noticed it in my own art work where if I tried to draw Tuatha, they HAD to have gold items, or it wasn't a Tuatha to me. Sidhe HAD to have silver items and/or silver light. The below pictures illustrate this i think. Now that you have read this, you know I didn't select the second one down for the hairdos......
http://4.bp.blogspot.com/-Klq_zDXG_Ek/TkZZonSSwlI/AAAAAAAAAJg/dX5Rvmu7tHU/s400/tuatha.jpg

http://shadowness.com/file/item3/69570/image_t6.jpg

http://4.bp.blogspot.com/-Klq_zDXG_Ek/TkZZonSSwlI/AAAAAAAAAJg/dX5Rvmu7tHU/s400/tuatha.jpg

http://shadowness.com/file/item3/69570/image_t6.jpg