To ensure you are fully showing, center and crop your photo and upload it at 180 by 180 pixels.
In photoshop (may work in other programs as well)
* create a box that is 180 by 180 pixels
* change the size of your desired photo making it just a little larger than that box
* drag desired image into the box
* once there, ensure that 'show bounding box' is clicked
* now drag the corner of your image while holding down the shift key (to keep its proportions) until it fits perfectly within the box
* make sure it's flattened and saved as a jpeg
Other Option:
* create a box that is 180 by 180 pixels
* change either the height or width of your photo so that the largest side is 180 pixels
* drag that into the box
:-)