Totally agree @Faith-and-Hope - changes to either written text and/or art need to be absolutely the author's. As a teacher you can make suggestions on how 'works' can be improved but it is so much more authentic if you can actually guide your students to come up with such improvements on their own. This becomes more about teachig them the skills to be able to identify how a 'work' can be enhanced rather than making overt suggestions yourself. Sometimes this means looking at a piece of writing or an art piece in it's totality and asking such questions as 'does it convey the true meaning that you want to convey', and other times it is highlighting a small section and asking how they believe it could be improved to further enhance the overall meaning of what they are trying to say. It does. at times, become a fine line between 'guiding' and 'influencing' - and the ability of a teacher to be able to both recognise the difference and be conscious of which one they are actually utilising is a skill in itself.