This is just overusing a new talent. This practice quickly refines itself into more conventional punctuation with a little discussion and support. Question Marks Periods Quotation marks Such conventions as paragraphing and sentence structure are best left for older students who can peruse their work at a glance. Younger students simply do not have the visual maturity to do this. When an editor sends in work to be published it has correct spelling and punctuation, although this is not always done by the writer.
Publishing provides extra incentive to continue writing.
Everyone loves to hold an audience. Excessive expression then becomes a language lesson punishment. Remember focus on strengths. It's not the major leagues, but it's a great start.