This is a low resolution photo. You can tell that its low resolution because its blurry and you can see all the pixels of the photograph. Photos with low resolution are good for the web because they take up less space and they still look okay on computers because computers don't have that many pixels in the screen.
This is a high resolution photo, it is crisp and clear. You can see all the detail like the spots on the flower and the hair on the bumble bee. Photos with high resolution are good for printing because they will still look good after you print unlike the low resolution.
This photo is high contrast. The black back ground combats the light grey of the peas and makes them stand out. You can see everything clearly in this photo because of the contrast difference.
This image is low contrast. Everything is this photo is about the same value. This makes you get lost in the photo unsure of what to look at and what the focal point is.
This photograph is very over exposed. There is too much light in this photo. Over exposure makes the photo too bright and everything is about the same value. The over exposure makes it very hard to look at this photo.
This photo is under exposed, there is not enough light in this photo. You can't make out what us what in this photo because everything is dark and about the same value.
This image has a shallow depth of field. This means the background is blurred while her face is in focus. This draws your attention to what is in focus.