For your first and with the tool you used I think it's okay. If you had the proper tools I would say that it's flat looking. But even with proper tools I'm sure this is an art form that takes a while to master. (Isn't this the same thing the US currency is done with?) They are done in the negative though and that's super tough.

I think you should continue this art form even after the class is over and show us what you can do in a year.