Please feel free to comment.* On my stories. Or on anything really.
* I will appreciate any comments, positive or negative. However, please if you are submitting a negative comment could you: a) use euphemisms b) say 'Don't take it personally, but...' or c) use a Comments Sandwich: Good, Negative (i.e. what you actually wanted to say), Good. You can make the bread comments pretty generic/trivial - I like your hair, your writing is pure cheese, I like the green of your titles - but it just helps to have the starch.