Yes there is a fine line between offering advice or helping and interfering, Nour. I have been tempted to offer advice to some of my colleagues here at Medium at times, but usually think better of it.
If I see a typo or error I will probably let them know in private notes, but if it is just my opinion or critique on how they wrote a piece of poetry for instance, I will usually bite my tongue and keep it to myself. This may be the wrong approach but it is better than risking them taking offence. Beautiful images by the way.