"A picture is worth 1,000 words." they say. Always load up as much as you MLS provider will allow. Do not trick the pictures with color enhancement or widen a room to create illusions of something better than what it actually is. You are only deceiving customers when they see the place. However, when listing a home lived by very horders, cluttery, untidy and sometimes filthy people (and yes, some of those people can be living in million $ homes), it is better to not put inside pictures except for at least the outside. But, if you can (and that is not easy a task) try to make those people to clean up, unclutter, and maybe stage their furniture.
Avoid taking cell phone pictures unless you know that your phone has the capability to shoot photos with very high pixel resolutions.