When writing feedback, make it R.E.D.
STUDENT GUIDE TO
Your feedback should be relevant to the objective of the assignment.
Giving an example helps the person see what you're thinking.
One to two words is not enough. Give the person specific reasons and details for improvement.
I like how you gave specific evidence from the text to support your claim. Here's how to make this even better...
I like what you have here but to meet all of the criteria, you could add more information on [insert specific example here].
The goal of feedback is to let the student know what they did well and give suggestions to make it their best work.