Download these pictures Brooks linked.

http://www.barcodegames.com/RandomFaces.zip

Go into each folder and copy and paste just the pictures here:

C:\Program Files (x86)\Wolverine Studios\Draft Day Sports - College Football 2017\Data\images\players

Once copied, open the game and load your league.

Go to options, then under Association settings, "Assign Player Photos" change to "random" in the drop drown, then click SAVE under the rest styles button.

Now go back and click the "reset picks" button and after it completes you should have player picks.