To tell a student “great job”or “this needs work” is a missed opportunity.
Everyone loves to hear they did a great job. And perhaps your student really did nail this latest assignment. But the problem with “great job” is this: it’s not specific. There is no indication of what was done that was successful, and no information about how to replicate this success in future projects.
I don’t grade students, I use feedback to help the students learn from their mistakes and re-submit their work.