Which comment with which drawing?

the comments on your page? well, those comments are either about you, your drawings, tutorials, etc..

While the comments for the draws is seen in the site of the drawing.

below is the place where you can see your friend requests, messages and comments

as you can see above, those are comments for the drawing. it depends on the user who wants to comment either they want to comment on your profile or the drawing. hope this could help