Is it okay to have articles 3 directories down (www.domain/1/2) ? Also, is it a good idea to have your articles as an index page in a sub dir.? for example (www.domain/foodphotography/index.html) Is one tactic better than another? Thanks
It's more about your linking structure than it is about where a page lives in your directory structure. Your articles can live anywhere and still rank equally as well so long as you link to them from the same places.
I prefer to include directory name in URL when I know the same page doesn't belong to 2 directories. Otherwise breadcrumbing can always give a great internal linking structure.