See How can we do photo critiques? and Should Photo Critiques be allowed? for previous discussion. It's generally been the consensus in the past that this is outside the charter of the site.
But our main problem right now is lack of questions. And a good portion of the questions we get are "16-92mm f/3.2 vs 14-87mm f/3.9 which to buy?" — which I think we also really only tolerate because there's not much coming in. I'd much rather have the photo-critique questions than many more of those!
I'd like to open the door to more questions about how to make a good photo, and specifically encourage people to post examples as part of the question.
Unlike a photo critique, I think they should focus on a specific concern, rather than open "what do you think of my photo". I think What is a point of interest in a photograph and where is it lacking in this candle picture? is a great example of this. More questions like this would be great for the site, and really help us grow.
Right now, the site already says that specific questions like this are allowed, but we've tended to interpret that as meaning specific technical issues. How can we expand that and make it not just allowed but encouraged?