Billy Pip, the My Photos page's routing involves the dynamic variable "username". The URL of this page depends on which user is logged in.
Therefore making the content of the page a default one will require complex custom code modifications.
Unfortunately I can not provide you with detailed instructions. You will need to modify more then two or three files such as the controllers/photo.php file , init.php file, activivate.php file and it requires a good knowledge of .php.
If you are not familiar with the plugin development or code modification, it would be better for you to find a developer who can help you. You can do this here:
http://www.oxwall.org/market/specialists