After you've filled in some snapshots about your team members, you can look at the visualisation of this data on their profile. This will show you the evolution your team member went through and how they compare to the rest of your team or the company average.
As a team lead you can find a 'Snapshots' tab on your team member's profile page. Accessing this tab will show you the results spotted on a graph, divided per question. On that graph you will see the historical evolution over time of your team member, the team(s) and the organisation.
You can click on 'Read feedback on this question' to find out the motivation behind every score.