Hi Kelly! Right now, I am still learning to sketch myself and wasn’t going to comment on your sketches because of this but since no one else commented yet…
I think overall your sketches are looking good! Maybe this is more of a hardgoods thing, but maybe you could try to make your border lineweight heavier? Also on your luggage and backpacks, I can clearly see some secondary zippers but I was having a hard time understanding where the main, largest zippers would be in the sketches.
This is off topic but are those green marker comments from your professor 
? Maybe this is a typical design school thing to get you to not treat any sketch as a precious thing (which I understand) but I would have to fight the urge of being a little annoyed to have someone giving me that type of feedback on my sketches haha. One bonus of seeking feedback on Core77 is that our feedback can’t ruin your original sketch!