Completing your User Account improves your transparency as a host. It is also a good way for you to introduce yourself to guests - providing a full profile about yourself helps to increase the possibility of bookings as some guests prefer knowing a bit about the host in advance.
Having a completed User Profile also allows you to benefit from Wimdu special features such as SMS notification.
We recommend that your upload a picture of yourself as it is another way to improve transparency and allow guests to know you better. If you prefer not to upload a profile picture, give a full description about yourself so guests can get a better idea of who will they be staying with or whom they will rent the property from.