I too like to recieve constructive critism (but I expect it to be constructive, meaning you actually help me by telling me what I could've done better, I do not however appreciate people who say anyone sucks, no one sucks, we're just a work in progress)...

I actually give myself a lot of critism, to the point where I've only been using Poser since 2008/09 and I've went from this:

To this:

And I still hope to get even better.