Relevant section from the Webmasters FAQ:
You should only ask practical, answerable questions based on actual
problems that you face. Chatty, open-ended questions diminish the
usefulness of our site and push other questions off the front page.
Your questions should be reasonably scoped. If you can imagine an
entire book that answers your question, you’re asking too much.
If your motivation for asking the question is "I would like to
participate in a discussion about ...", then you should not be
asking here. However, if your motivation is "I would like others to
explain ... to me", then you are probably OK.
(Discussions are of course welcome in our real time web chat.)
I cannot imagine too many ways that feedback solicitations could fit within these guidelines, however, you are welcome to ask if you feel otherwise.
Please consider other channels for any extended discussion of your site's design (as mentioned in the FAQ, chat is an appropriate channel for discussion and you should be able to search up at least a handful of webmaster forums which offer designers a place to review each others' work).