There's no such link as it we use ajax form for uploading photos. 

<li><a href="javascript://" photo_upload>

<li><a href="profile/avatar" change_avatar>Change avatar</a></li>

Adding link (change_avatar) here avatar picture button but can not be added to other (photo_upload) links

photo_upload - Photo upload link ?
change_avatar - Change avatar link

Thank you.

lol

The Photo Upload page doesn't physically exist. By clicking the photo upload link you call Ajax form. You can see how it works in /ow_plugins/photo/components/ajax_upload.php file.

If you provided information about changes you would like to do, we could give you possible solutions.

Photo upload button make.

Example:

Thank you for answer.

So i can not use any link? I have a page where stands now:
You can upload your photo's here. But i dont know what link to add
please advice?

falancas, thank you for explanation.
As I understood, you want to insert the image instead of the upload photos link in Welcome widget.
This link label is hardcoded that's why you can't change it via Admin Area. It will be custom code modification.
You need to make changes in /ow_system_plugins/base/components/welcome_widget.php file.

P.S. Remember all changes will be lost after updating the site.

Marco, as I mentioned photo upload page doesn't exist.
When you click upload photo link at Welcome widget it's calls the method which open upload photo form. You can find the path to this method in my answer above.

You can add the link to Photo list page for example: http://yoursitename.com/photo/viewlist/latest

Or if you are familiar with the code modification, you can develop such kind of functionality for your custom page.