The best way to ensure feedback is to comment on others' work as much as you can and to respond to the comments that others have made on your own work. We're all here to get feedback, so there's an element of reciprocity ...and I can't help but notice that although you have had comments on your poem, you haven't posted any about anyone else's work....
Now I know that commenting on others' work can be very difficult, and poetry is really hard...but I thnk it's a valuable skill which I have got better at since I have been on WW, and I really believe that it helps my own writing. Engaging with other work makes you analyse and explain, and the more you can articulate what you like/don't like or what works/doesn't work, the more you are likely to be able to bring that to bear when you write something new yourself and you're re-drafting it.
If you still don't feel confident about critical responses, that's entirely understandable; but then you can try making supportive comments perhaps?
As Bazz says, the more you participate, the more likely you'll get comments back. If people have taken the time to comment on your work, then it's always worth responding and engaging with what they say, even if just to say, 'thanks for commenting'. It works wonders in terms of generating more comments on your own work.
Finally I would say that the Poetry Group does sometimes get quiet, but please do join in as much as you can :) you're most welcome.
Edited by FelixBenson at 19:59:00 on 11 February 2016