When giving people feedback, be sure to use the "mark as complete" or "request revisions" tools so they can be given some kind of next steps - without that, the student has no way of actually getting their completion badge for the lesson. It actually doesn't count as a critique in the system either, and so their submission will still appear in the list as not having received feedback.

Also, in general you should try not to compare the person's work with your own - I understand that people often do that out of a general sense of anxiety and a lack of confidence. One thing that can help with doing so is following Elodin's critique guides for Lesson 1 and the 250 Box Challenge. For these early lessons, you can look at them a little like a checklist, and quickly go through the exercises to identify anywhere the student may have misunderstood something.