10:21 PM, Tuesday December 20th 2022
As TAs are not paid for handling revisions (as we don't want them to be in a position to be tempted to assign more than are necessary), they decide whether or not they should be assigned. So in the future, you can make use of our discord server to get further feedback by other members of the community on individual exercises outside of what is explicitly assigned in the course.
I will mention that generally you're doing fine, but the second leaf of the three falls outside of the bounds of the earlier steps of construction in cases like this. Here and here you should be extending that leaf right to the bounds of the previous stage to achieve as close and tight a relationship with the existing structure as possible.