I want to encourage everyone to avoid underestimating the value of feedback in learning anything (especially writing). It is so important that you can simply rest on the fact that without feedback there is no learning. Imagine a golfer NEVER KNOWING where his shot lands, or never hearing a putt go in the hole. Learning the sport becomes impossible. Public speakers almost always improve if they have folks critiquing them (or can watch themselves on video). A singer cannot possibly stay on key (or improve) if she NEVER HEARS her voice or the other instruments. These are all FEEDBACK mechanisms.
Now, since writing is about the scariest thing anyone can do (it is permanent…written…can be passed along), we rarely seek feedback without some significant growing up! Since we are educating our kids, we can just baste (cooking definition) them with it anyway! 
But, you must do it right (or, at least, right enough).
We have video training for giving feedback in the unique way we’ve designed (for grammar, punctuation, spelling, creativity, etc.), but let me tell you the essentials:
1. Use a RED PEN to mark things your student should improve (correct)
2. Use a GREEN PEN to mark things your student should do more of (encouragement)
3. When making suggestions use these exact words, “Does this sound better?”
4. Don’t overwhelm — Instead, please focus on one or two things at a time until mastered (example: Just work on capitalizing the first word in a sentence if that’s an issue).
Blessings,
Fred Lybrand
P.S. Here’s where to learn more about us: www.advanced-writing-resources.com
