Get latest posts in multisite + metadata

I need to retrieve latest posts for each of my sub-sites with additional metadata. This question was of good use but i cannot seem to make it fit for my needs.

This is the data i need from each latest post:
1. Post title
2. Date posted
3. Author name
4. Author profile picture

I need to store that data in an array.

Maybe i shouldnt query: network_query_posts($args); but somehow query the authors and from there grab their latest post and additional info. Or is there someway to get all that data from network_query_posts($args); ? Or maybe another way to do it?

Could anyone help me achieve this?