Hi Steffen,
I believe UM 2.0 is not officially out yet, but I may have found a test code that might work getting the user profile images.
Add this custom code to the functions.php in your theme/child theme directory (copy from line 3 only!). Before editing, please make sure to have a full site back-up just in case!
Please note that I have not been able to test this on UM 2.0 yet, so it may not work!