Michael --
Some of the answers you've been given (work harder! etc) are pat. Sure, work harder, get better. And there is something in the "time" argument. The George Tames photos from the 1950s are medium format -- 6x6 it looks like, unless he just happened to crop them all square which, being a news photographer, he would not have. MF is traveling light by the standards of those days: a lot of papers and magazines still required their photographers to use the Speed Graphics and other 4x5 view cameras out there. In any case he was likely using a Rolleiflex or Hasselblad or something very close -- folding rangefinder 6x6 (most were 6x7 or 6x9 in any case) outfits were generally not a newsman's choice. Now, those cameras gave you the image backwards. They require very careful composition. And not only did he know how to compose a picture, each of them handles the light, which is quite powerful, flawlessly. Is he using filters? probably not. In any case he knew his film and his camera and the exposures are perfect (with help from a superb lab, I might add; the NYT lab was not as good as Time-Life's but it was pretty damn good). So you can work your ass off but if you don't actually learn these technical skills, you're out of luck. I'm a dumbass photographer. I take a lot of pictures. I am forty rolls behind in processing them. Do I take notes? No. I look at a picture that really works and do I know what the hell I did? Not likely. I haven't learned to slow down and think. Take notes. As a journalist he had to take notes for all those photos so they could be properly identified and used. Time. thought. Look at picture 15 in the Tames lineup. You think he just happened upon that? Look at the lighting! He'd have needed a set of full blown studio lights to do that on his own. He saw the light and saw the man and put him there -- no way the guy was just standing perfectly lighted waiting for a New York Times photographer to walk by.... that is a great photograph.
Now, the other thing. There's time. And there's place. There's an old expression, attributed to various photographers, as the secret to success: F8 and be there. In other words you have to be where the picture is; you have to move. You have to search. Home, comfort, daily routines, favorite coffee place: forget it. Go to Afghanistan and get your ass shot. Go to the vast wheat fields and stinking broken down trailers of the Great Plains wheat fields. Take risks. Get to know people and take their pictures. And, regarding the F8 part: be in focus.
Lastly the Larry Towell: I went to the images search engine in Google, put his name in, a page of amazing shots sprang up, and I thought: Magnum. The look is unmistakable. Go check out Magnum's website and read its history if you are unfamiliar. These masters of the past have much to teach us, both about the craft of art and also about the vivid moral uncertainties -- the dangerous unknowing -- at the core of our experience.