I'm gonna shout out to lil here so she can see this question. I'm pretty certain she's keen on supporting people and their writing. In fact, just the other day we had an impromptu poetry exercise on the IRC.
That said, I'd probably just post something and ask for critiques. I'd also recommend you follow the tag #writebetterdammit. People use it to post some good examples of the dos and don'ts of writing. Also, if you're looking for writing prompts, keep an eye out for #todayswritingprompt as well.
In case you don't know how to follow tags, click on a tag that interest you and it'll open up a page. Click "follow xxx" and viola! Anything posted with that tag will show up in your feed. Conversely, if you want to avoid anything with that tag, click "filter xxx" and anything with that tag will be removed from both your feed as well as the global postings. I caution you to use the filter button sparingly though, because you might miss out on some good posts that actually might interest you.