You’ve done well with your assignment. You’d be amazed how many people have trouble with this particular assignment!
Here are a couple of notes on your images:
1: I’m not a fan of centering items right in the middle of the frame but this might be what you wanted. Maybe moving this element just off center a little would work.
2: Given this is a depth of field assignment you have to be careful about it. In this case your main element isn’t entirely in focus. No worries, just be careful!