For me, I generally use that rule as a guide to start with. If an image develops in such a way that it "feels" wrong under that rule, well.. then I just throw the rule out the window. LOL.
Mostly I go with the flow. Does the image feel the way I want it to? Does it draw the viewer's eye to the parts of it that I want it to? For some images, I end up implementing the rule of thirds not until well into the development/setup of the scene, as the image just "lacks" something, and that seems to give it the extra oomph it needed. Some images, I start out with that rule in place, and remove it. Sometimes, they end up falling into that rule unintentionally; meaning I did not plan it, it just kind of set itself up that way. I really just go with the flow, and what seems to suit the image artistically as I make them.
High Tide is an image that just kind of accidentally ended up with that rule in play.
Tree People is one of my images where the scene was just naturally flowing that way (with the rule of thirds in play), and so I just let it do so for the rest of the setup.
Oh, Hi, Daddy is an example of a picture that I originally had started to set it up WITH that rule, and artistically speaking, I felt that it was hurting the image, so I ended up throwing it out.
And
Tree People 2 is a piece that I had originally been trying to work with in a portrait orientation, and it was coming out totally lack-luster. I made a conscious decision in this case to shift it to a landscape setup, with the rule in play, and this was the final outcome of that change.
And then sometimes, like with
Draw the Line, I totally throw that rule into the trash can entirely, and the end result does not fit into either the portrait, OR landscape/Rule of Three type of setup.
So for me, it just really all depends on the image, and what's going on in the picture, what kind of flow it has, where I want the viewer's eye to travel to and from, and what kind of an emotional impact I want the image to have.
As far as other photographic guiding points... I do not have any kind of background in professional photograph or lighting at all. But when lighting a scene, I always kind of bear in mind the way light is casted, and how shadows react, the way they fall and in what directions from the real world around us. I try to bear in mind how dark or how light the shadows normally are in a real world environment that might apply. I spent a lot of time just kind of studying the shadows and lighting in all kinds of areas around me, offline.
The composition rules I think are a good starting point; a good guide. Sometimes, they enhance our artwork, sometimes they hurt it. Each image is different, and I basically just let the image do the talking. I flow with it; if the rule is needed and not in effect, I shift my setup to use it. If the rule is in effect but hurting the image artistically, I throw it out the window! And sometimes I end up with a render that uses the rule of thirds and I never consciously put it into effect; it just kind of
happened. (Okay, that happens a lot, I admit. LOL)
There's my take on it, Hornet and Glenn.