Phoxo offers all basic options offered in other major photo edition programs like Photoshop or Gimp: brushes, colors, geometric shapes, etc, layers and special effects.
It works pretty well and smoothly. Its interface is really intuitive and you'll get used to it in a matter of seconds. In addition, when you modifiy anything it takes a really short moment to be applied.
Phoxo is a really interesting photo editor, perfect for minor changes or for those who want a good photo edition program but don't want to make like difficult for themselves.