How many pixels in a standard photo?

A pixel is a bit of information in an image file. They do not relate directly to the size of the image. You may be confusing the concept of pixel count with the practice of expressing image dimensions in pixels.

Generally speaking, the more pixels the better. The more information in the file, the more detail that can be included in the printed image, and the larger the image can be printed while maintaining good quality. Average pixel counts with newer consumer digital cameras run between 6 and 10 megapixels, as a rule. That translates to quality prints of at least 8 x 10 inches, and in many cases even larger.