It's a pretty common request on this board to tell if your photo is good or not, so I'm going to share two simple litmus tests that anyone (regardless of skill level) can do with a very minimal amount of effort.

THE THUMBNAIL TEST:

Want to know if you've made a successful composition, if you've created tonality and contrast, if you've managed to create a visually arresting image? Look at the thumbnail. Without fail, most great photos are obviously good from a very small, low res thumbnail. Graphic designers know this, illustrators know this, but for some reason this idea escapes photographers. Take a look at your photos either in lightroom's grid view or in windows explorer, or even just zoom out in the editor. You should zoom out until individual details are obscured and you're just perceiving abstract shapes and colors. When selecting which photos to commit to editing, only pick the photos that jump out in the thumbnail view and discard the rest. There's a reason a successful grid is so crucial to a successful instagram profile or gallery on your website. If you can create photos that jump out of the thumbnail, then you can entice people to click in for a closer look.

Attached is a comparison. On the top, we have a google search for Edward Burtynsky. On the bottom, we have a flickr search for "50mm". I've downscaled them to make the thumbnails more abstract. Which of these are more visually arresting? Apply that same scrutiny to your own work and you might be surprised. Again, you should make the thumbnails small enough that you become more objective and emotionally disengaged from the actual contents of the photo.

THE WRITTEN TEST:

This one is a little simpler. It applies more to the ethical and narrative concerns of your photo than the visual, but it can help be a major breakthrough for some in the way they think about your work. It's easy: describe your photo using words only. I'll give you a few examples, and they should immediately spring to mind: