In reading through the comments I'm reminded that there are always little bits of truth, little bits of speculation, and even a few bits of false ideas.
An earlier comments said "good images require minimal editing", well yes but, the key is what is acceptable in the final image. A wise man once told me that the work involved in the last little bit out of an images may have the least noticeable effect on it, but elevate the image from good to excellent. If you're satisfied with an image as is great, but all "good" images can be improved.
Another comment touted "experience" as the key to knowing if an image was good. I'd say "experience" is more important in knowing how to set your exposure for the final image you want. In most cases I'd strive to completely fill the sensor, but in this example my goal was to best illustrate the texture of these cotton bolls. I knew the whites would be touchy, and my darkest shadow areas were devoid of any details. So I choose to protect the whites. Here's the original image.
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As you can see from the screenshot of the histogram, it's a full stop under.
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I did that because I needed room to set the White point, I knew the deepest shadows had no detail to preserve, and I had specific editing I wanted to do to enhance the cotton texture. The final
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and a screen shot of the new histogram
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So, while the histogram is useful, it's not necessarily the final decision on a good or bad image, and while I could have exposed for a full exposure, it would not have provided the same result of the final image which was to show the texture of a white cotton boll.