For the last one it is maybe the most important. Either it is a snap-shot with some toys and a dog, or it is a well-aligned architectural photograph that uses the toys to lead into the image where the dog is. I find it makes all the difference. These are images that you would otherwise need a tripod and a tilt/shift capable camera for, and really quick too, if you wanted the boxer where she is.
So, how did I find this out? This is the second photographic necessity, I would argue, for all serious photographers. At least if you don't have an
imp employee who does post-capture for you. You go to the Luminous-Landscape, click on "store" and buy their Lightroom 4 tutorial. With intro if you haven't used it before, without if you just haven't used version 4. It is the best instruction to be had for money. Well person-to-person teaching might reach the same level, but arguably not in the evening after the family has gone to bed, which is when I have time. Buying Lightroom without the tutorial is like buying a car without a key.