spot on bella,I always get people msg ask me to comment their pics or rate them cocks,I would usually do my best to leave some comments ,however some of the pics are...
It is quiet hard to comment something you are not so into it,have to be sincere and not offend

I know not everyone has a good camera,and not easy take pics if just by yourself,I remember when i first post my pic,i never ask people to leave comments,and I will always leave comments to people who come visit my page,even they don;t say anything of mine,I feel very thankful and humble that people leave comments to me and even give points,there are many people here are very kind and nice to me,so if you want to let people leave you some nice comments ,start doing from you

Ditto what Bella said... you don't NEED comments, you NEED conversation. Reach out and say hello to all, visit other peoples pages, say Hi, Im new and love your profile... Just some advice...