Behance has a new 'Work in Progress' function. You can post iterations of your work as it progresses and show your process . . . and perhaps get some constructive feedback. I have a new project I am working on right now and am trying it out. Take a look. It is a pretty well designed feature and it is interesting to see how peoples work develops. I do find though that getting any serious feedback and not just positive, 'pat on the back' comments is pretty tricky in most places on the web. It is really hard to find a forum for critical response. Working at home alone all the time can be very creatively isolating. It is great to have so many talented peoples work art your fingertip (thanks interweb) but nothing beats a bit of interaction and conversation.